Chemistry-
General
Easy

Question

Free radical halogenation takes place in the presence of light or at high temperature (above 773K). Formation of halogen free radical intermediate takes place in first step called chain initiation step.
C l subscript 2 end subscript stack ⟶ with h v on top 2 C l to the power of ring operator end exponent
This reaction is mainly given by those compounds which have atleast one hydrogen atom present at s p to the power of 3 end exponent -hybrid carbon. Reactivity of s p to the power of 3 end exponent -hybrid carbon depends on the reactivity of reaction intermediate. The relative rate of formation of alkyl radicals by a chlorine radical is :
text Tertiary  end text stack greater than with left parenthesis 5 right parenthesis below stack text  Secondary  end text with left parenthesis 3.8 right parenthesis below greater than stack text  Primary  end text with left parenthesis 1 right parenthesis below
Percentage yield of the product =fraction numerator R e l a t i v e blank a m o u n t blank cross times 100 over denominator S u m blank o f blank r e l a t i v e blank a m o u n t s end fraction
Relative amount = Number of hydrogen atoms on the respective carbon x relative reactivity.
NBS (N-bromo succinimide) is used for bromination at allylic and benzylic carbon, whereas Br2/hv gives bromination at . benzylic, allylic and alkyl carbon.
Chlorination of butane takes place as:

Percentage yield of 2-chlorobutane will be:

  1. fraction numerator 15 over denominator 21 end fraction cross times 100    
  2. fraction numerator 21 over denominator 21 end fraction cross times 100    
  3. fraction numerator 6 over denominator 21 end fraction cross times 100    
  4. fraction numerator 3 over denominator 21 end fraction cross times 100    

The correct answer is: fraction numerator 15 over denominator 21 end fraction cross times 100

Related Questions to study

General
Chemistry-

SN1 reaction is a first order nucleophilic substitution, e.g.,

The concentration of nucleophile does not appear in the rate law expression:
Reaction rate = k[ RX]
In a multistep organic reaction, the rate-limiting step is the slowest step. Rate determining step is represented by the following energy level diagram:


A reaction energy level diagram for an S subscript N to the power of 1 end exponent end subscript reaction. The rate limiting step is spontaneous dissociation of an alkyl halide to give a carbocation intermediate

S subscript N to the power of 1 end exponent end subscript reaction is:

SN1 reaction is a first order nucleophilic substitution, e.g.,

The concentration of nucleophile does not appear in the rate law expression:
Reaction rate = k[ RX]
In a multistep organic reaction, the rate-limiting step is the slowest step. Rate determining step is represented by the following energy level diagram:


A reaction energy level diagram for an S subscript N to the power of 1 end exponent end subscript reaction. The rate limiting step is spontaneous dissociation of an alkyl halide to give a carbocation intermediate

S subscript N to the power of 1 end exponent end subscript reaction is:

Chemistry-General
General
Chemistry-

SN1 reaction is a first order nucleophilic substitution, e.g.,

The concentration of nucleophile does not appear in the rate law expression:
Reaction rate = k[ RX]
In a multistep organic reaction, the rate-limiting step is the slowest step. Rate determining step is represented by the following energy level diagram:


A reaction energy level diagram for an S subscript N to the power of 1 end exponent end subscript reaction. The rate limiting step is spontaneous dissociation of an alkyl halide to give a carbocation intermediate

In the graph 3 for S subscript N to the power of 1 end exponent end subscript reaction, the rate limiting step is the spontaneous dissociation of alkyl halide and is given by:

SN1 reaction is a first order nucleophilic substitution, e.g.,

The concentration of nucleophile does not appear in the rate law expression:
Reaction rate = k[ RX]
In a multistep organic reaction, the rate-limiting step is the slowest step. Rate determining step is represented by the following energy level diagram:


A reaction energy level diagram for an S subscript N to the power of 1 end exponent end subscript reaction. The rate limiting step is spontaneous dissociation of an alkyl halide to give a carbocation intermediate

In the graph 3 for S subscript N to the power of 1 end exponent end subscript reaction, the rate limiting step is the spontaneous dissociation of alkyl halide and is given by:

Chemistry-General
General
Chemistry-

SN1 reaction is a first order nucleophilic substitution, e.g.,

The concentration of nucleophile does not appear in the rate law expression:
Reaction rate = k[ RX]
In a multistep organic reaction, the rate-limiting step is the slowest step. Rate determining step is represented by the following energy level diagram:


A reaction energy level diagram for an S subscript N to the power of 1 end exponent end subscript reaction. The rate limiting step is spontaneous dissociation of an alkyl halide to give a carbocation intermediate

Select the correct statement(s) about the graph 2:

SN1 reaction is a first order nucleophilic substitution, e.g.,

The concentration of nucleophile does not appear in the rate law expression:
Reaction rate = k[ RX]
In a multistep organic reaction, the rate-limiting step is the slowest step. Rate determining step is represented by the following energy level diagram:


A reaction energy level diagram for an S subscript N to the power of 1 end exponent end subscript reaction. The rate limiting step is spontaneous dissociation of an alkyl halide to give a carbocation intermediate

Select the correct statement(s) about the graph 2:

Chemistry-General
parallel
General
Chemistry-

SN1 reaction is a first order nucleophilic substitution, e.g.,

The concentration of nucleophile does not appear in the rate law expression:
Reaction rate = k[ RX]
In a multistep organic reaction, the rate-limiting step is the slowest step. Rate determining step is represented by the following energy level diagram:


A reaction energy level diagram for an S subscript N to the power of 1 end exponent end subscript reaction. The rate limiting step is spontaneous dissociation of an alkyl halide to give a carbocation intermediate

In S subscript N to the power of 1 end exponent end subscript reaction, the hybridization changes in rate determination step. Select the correct change among the following:

SN1 reaction is a first order nucleophilic substitution, e.g.,

The concentration of nucleophile does not appear in the rate law expression:
Reaction rate = k[ RX]
In a multistep organic reaction, the rate-limiting step is the slowest step. Rate determining step is represented by the following energy level diagram:


A reaction energy level diagram for an S subscript N to the power of 1 end exponent end subscript reaction. The rate limiting step is spontaneous dissociation of an alkyl halide to give a carbocation intermediate

In S subscript N to the power of 1 end exponent end subscript reaction, the hybridization changes in rate determination step. Select the correct change among the following:

Chemistry-General
General
Chemistry-

The removal of two atoms or groups, one generally hydrogen open parentheses H to the power of plus end exponent close parentheses and the other a leaving group open parentheses L to the power of minus end exponent close parentheses resulting in the formation of unsaturated compound is known as elimination reaction.

In E subscript 1 end subscript (elimination) reactions, the C minus L bond is broken heterolytic ally (in step 1) to form a carbocation (as in S subscript N to the power of 1 end exponent end subscript reaction) in which open parentheses L to the power of minus end exponent close) is lost (rate determining step). The carbocation (in step 2) loses a proton from the beta-carbon atom by a base (nucleophile) to form an alkene. E subscript 1 end subscript reaction is favoured in compounds in which the leaving group is at secondary open parentheses 2 to the power of ring operator end exponent close parentheses to the power of ´ end exponent or tertiary open parentheses 3 to the power of ring operator end exponent close parentheses position. In E subscript 2 end subscript text end text left parenthesis e l i m i n a t i o n right parenthesis text end text r e a c t i o n s comma text end text t w o text end text s i g m a text end text b o n d s text end text a r e text end text b r o k e n text end text a n d text end text a formed simultaneously. E subscript 2 end subscript reactions occur in one step through a transition state.

E subscript 2 end subscript reactions are most common in haloalkanes (particularly, 1 to the power of ring operator end exponent) and better the leaving group higher is the E subscript 1 end subscript reaction. In E subscript 2 end subscript reactions, both the leaving groups should be antiplanar.
E subscript 1 end subscript cb (Elimination unimolecular conjugate base) reaction involves the removal of proton by. a conjugate base (step 1) to produce carbanion which loses a leaving group to form an alkene (step 2) and is a slow step.
Neopentyl bromide undergoes dehydrohalogenation to give alkene even though it has no beta-hydrogen. This is due to:

The removal of two atoms or groups, one generally hydrogen open parentheses H to the power of plus end exponent close parentheses and the other a leaving group open parentheses L to the power of minus end exponent close parentheses resulting in the formation of unsaturated compound is known as elimination reaction.

In E subscript 1 end subscript (elimination) reactions, the C minus L bond is broken heterolytic ally (in step 1) to form a carbocation (as in S subscript N to the power of 1 end exponent end subscript reaction) in which open parentheses L to the power of minus end exponent close) is lost (rate determining step). The carbocation (in step 2) loses a proton from the beta-carbon atom by a base (nucleophile) to form an alkene. E subscript 1 end subscript reaction is favoured in compounds in which the leaving group is at secondary open parentheses 2 to the power of ring operator end exponent close parentheses to the power of ´ end exponent or tertiary open parentheses 3 to the power of ring operator end exponent close parentheses position. In E subscript 2 end subscript text end text left parenthesis e l i m i n a t i o n right parenthesis text end text r e a c t i o n s comma text end text t w o text end text s i g m a text end text b o n d s text end text a r e text end text b r o k e n text end text a n d text end text a formed simultaneously. E subscript 2 end subscript reactions occur in one step through a transition state.

E subscript 2 end subscript reactions are most common in haloalkanes (particularly, 1 to the power of ring operator end exponent) and better the leaving group higher is the E subscript 1 end subscript reaction. In E subscript 2 end subscript reactions, both the leaving groups should be antiplanar.
E subscript 1 end subscript cb (Elimination unimolecular conjugate base) reaction involves the removal of proton by. a conjugate base (step 1) to produce carbanion which loses a leaving group to form an alkene (step 2) and is a slow step.
Neopentyl bromide undergoes dehydrohalogenation to give alkene even though it has no beta-hydrogen. This is due to:

Chemistry-General
General
Chemistry-

The removal of two atoms or groups, one generally hydrogen open parentheses H to the power of plus end exponent close parentheses and the other a leaving group open parentheses L to the power of minus end exponent close parentheses resulting in the formation of unsaturated compound is known as elimination reaction.

In E subscript 1 end subscript (elimination) reactions, the C minus L bond is broken heterolytic ally (in step 1) to form a carbocation (as in S subscript N to the power of 1 end exponent end subscript reaction) in which open parentheses L to the power of minus end exponent close) is lost (rate determining step). The carbocation (in step 2) loses a proton from the beta-carbon atom by a base (nucleophile) to form an alkene. E subscript 1 end subscript reaction is favoured in compounds in which the leaving group is at secondary open parentheses 2 to the power of ring operator end exponent close parentheses to the power of ´ end exponent or tertiary open parentheses 3 to the power of ring operator end exponent close parentheses position. In E subscript 2 end subscript text end text left parenthesis e l i m i n a t i o n right parenthesis text end text r e a c t i o n s comma text end text t w o text end text s i g m a text end text b o n d s text end text a r e text end text b r o k e n text end text a n d text end text a formed simultaneously. E subscript 2 end subscript reactions occur in one step through a transition state.

E subscript 2 end subscript reactions are most common in haloalkanes (particularly, 1 to the power of ring operator end exponent) and better the leaving group higher is the E subscript 1 end subscript reaction. In E subscript 2 end subscript reactions, both the leaving groups should be antiplanar.
E subscript 1 end subscript cb (Elimination unimolecular conjugate base) reaction involves the removal of proton by. a conjugate base (step 1) to produce carbanion which loses a leaving group to form an alkene (step 2) and is a slow step.
2-Br-omopentane is heated with potassium ethoxide in ethanol. The major product obtained is:

The removal of two atoms or groups, one generally hydrogen open parentheses H to the power of plus end exponent close parentheses and the other a leaving group open parentheses L to the power of minus end exponent close parentheses resulting in the formation of unsaturated compound is known as elimination reaction.

In E subscript 1 end subscript (elimination) reactions, the C minus L bond is broken heterolytic ally (in step 1) to form a carbocation (as in S subscript N to the power of 1 end exponent end subscript reaction) in which open parentheses L to the power of minus end exponent close) is lost (rate determining step). The carbocation (in step 2) loses a proton from the beta-carbon atom by a base (nucleophile) to form an alkene. E subscript 1 end subscript reaction is favoured in compounds in which the leaving group is at secondary open parentheses 2 to the power of ring operator end exponent close parentheses to the power of ´ end exponent or tertiary open parentheses 3 to the power of ring operator end exponent close parentheses position. In E subscript 2 end subscript text end text left parenthesis e l i m i n a t i o n right parenthesis text end text r e a c t i o n s comma text end text t w o text end text s i g m a text end text b o n d s text end text a r e text end text b r o k e n text end text a n d text end text a formed simultaneously. E subscript 2 end subscript reactions occur in one step through a transition state.

E subscript 2 end subscript reactions are most common in haloalkanes (particularly, 1 to the power of ring operator end exponent) and better the leaving group higher is the E subscript 1 end subscript reaction. In E subscript 2 end subscript reactions, both the leaving groups should be antiplanar.
E subscript 1 end subscript cb (Elimination unimolecular conjugate base) reaction involves the removal of proton by. a conjugate base (step 1) to produce carbanion which loses a leaving group to form an alkene (step 2) and is a slow step.
2-Br-omopentane is heated with potassium ethoxide in ethanol. The major product obtained is:

Chemistry-General
parallel
General
Chemistry-

The removal of two atoms or groups, one generally hydrogen open parentheses H to the power of plus end exponent close parentheses and the other a leaving group open parentheses L to the power of minus end exponent close parentheses resulting in the formation of unsaturated compound is known as elimination reaction.

In E subscript 1 end subscript (elimination) reactions, the C minus L bond is broken heterolytic ally (in step 1) to form a carbocation (as in S subscript N to the power of 1 end exponent end subscript reaction) in which open parentheses L to the power of minus end exponent close) is lost (rate determining step). The carbocation (in step 2) loses a proton from the beta-carbon atom by a base (nucleophile) to form an alkene. E subscript 1 end subscript reaction is favoured in compounds in which the leaving group is at secondary open parentheses 2 to the power of ring operator end exponent close parentheses to the power of ´ end exponent or tertiary open parentheses 3 to the power of ring operator end exponent close parentheses position. In E subscript 2 end subscript text end text left parenthesis e l i m i n a t i o n right parenthesis text end text r e a c t i o n s comma text end text t w o text end text s i g m a text end text b o n d s text end text a r e text end text b r o k e n text end text a n d text end text a formed simultaneously. E subscript 2 end subscript reactions occur in one step through a transition state.

E subscript 2 end subscript reactions are most common in haloalkanes (particularly, 1 to the power of ring operator end exponent) and better the leaving group higher is the E subscript 1 end subscript reaction. In E subscript 2 end subscript reactions, both the leaving groups should be antiplanar.
E subscript 1 end subscript cb (Elimination unimolecular conjugate base) reaction involves the removal of proton by. a conjugate base (step 1) to produce carbanion which loses a leaving group to form an alkene (step 2) and is a slow step.

This reaction is an example of:

The removal of two atoms or groups, one generally hydrogen open parentheses H to the power of plus end exponent close parentheses and the other a leaving group open parentheses L to the power of minus end exponent close parentheses resulting in the formation of unsaturated compound is known as elimination reaction.

In E subscript 1 end subscript (elimination) reactions, the C minus L bond is broken heterolytic ally (in step 1) to form a carbocation (as in S subscript N to the power of 1 end exponent end subscript reaction) in which open parentheses L to the power of minus end exponent close) is lost (rate determining step). The carbocation (in step 2) loses a proton from the beta-carbon atom by a base (nucleophile) to form an alkene. E subscript 1 end subscript reaction is favoured in compounds in which the leaving group is at secondary open parentheses 2 to the power of ring operator end exponent close parentheses to the power of ´ end exponent or tertiary open parentheses 3 to the power of ring operator end exponent close parentheses position. In E subscript 2 end subscript text end text left parenthesis e l i m i n a t i o n right parenthesis text end text r e a c t i o n s comma text end text t w o text end text s i g m a text end text b o n d s text end text a r e text end text b r o k e n text end text a n d text end text a formed simultaneously. E subscript 2 end subscript reactions occur in one step through a transition state.

E subscript 2 end subscript reactions are most common in haloalkanes (particularly, 1 to the power of ring operator end exponent) and better the leaving group higher is the E subscript 1 end subscript reaction. In E subscript 2 end subscript reactions, both the leaving groups should be antiplanar.
E subscript 1 end subscript cb (Elimination unimolecular conjugate base) reaction involves the removal of proton by. a conjugate base (step 1) to produce carbanion which loses a leaving group to form an alkene (step 2) and is a slow step.

This reaction is an example of:

Chemistry-General
General
Maths-

For any real x, the expression 2 open parentheses K minus x close parentheses open square brackets x plus square root of x to the power of 2 end exponent plus K to the power of 2 end exponent end root close square brackets cannot exceed

For any real x, the expression 2 open parentheses K minus x close parentheses open square brackets x plus square root of x to the power of 2 end exponent plus K to the power of 2 end exponent end root close square brackets cannot exceed

Maths-General
General
Maths-

The number of real roots of open parentheses sin invisible function application 2 to the power of x end exponent close parentheses open parentheses cos invisible function application 2 to the power of x end exponent close parentheses equals fraction numerator 1 over denominator 4 end fraction open parentheses 2 to the power of x end exponent plus 2 to the power of negative x end exponent close parentheses is

The number of real roots of open parentheses sin invisible function application 2 to the power of x end exponent close parentheses open parentheses cos invisible function application 2 to the power of x end exponent close parentheses equals fraction numerator 1 over denominator 4 end fraction open parentheses 2 to the power of x end exponent plus 2 to the power of negative x end exponent close parentheses is

Maths-General
parallel
General
Maths-

If z1, z2, z3 are complex numbers such that∣z1∣=∣ z2 ∣=∣ z3 ∣=open vertical bar fraction numerator 1 over denominator z subscript 1 end subscript end fraction plus fraction numerator 1 over denominator z subscript 2 end subscript end fraction plus fraction numerator 1 over denominator z subscript 3 end subscript end fraction close vertical bar equals 1, thus, ∣ z1 + z2 + z3 ∣ is

If z1, z2, z3 are complex numbers such that∣z1∣=∣ z2 ∣=∣ z3 ∣=open vertical bar fraction numerator 1 over denominator z subscript 1 end subscript end fraction plus fraction numerator 1 over denominator z subscript 2 end subscript end fraction plus fraction numerator 1 over denominator z subscript 3 end subscript end fraction close vertical bar equals 1, thus, ∣ z1 + z2 + z3 ∣ is

Maths-General
General
Maths-

If the roots of the equation z2 + az + b = 0 are purely imaginary, then

If the roots of the equation z2 + az + b = 0 are purely imaginary, then

Maths-General
General
Maths-

The cube roots of unity

The cube roots of unity

Maths-General
parallel
General
Maths-

If z satisfies ∣ z − 1∣ < ∣ z + 3 ∣, then omega = 2z + 3 − i satisfies :

If z satisfies ∣ z − 1∣ < ∣ z + 3 ∣, then omega = 2z + 3 − i satisfies :

Maths-General
General
Maths-

A(z1), B(z2) and C(z3) be the vertices of an equilateral triangle in the argand plane such that ∣z1∣ = ∣z2∣ = ∣z3∣. Then which of the following is false ?

A(z1), B(z2) and C(z3) be the vertices of an equilateral triangle in the argand plane such that ∣z1∣ = ∣z2∣ = ∣z3∣. Then which of the following is false ?

Maths-General
General
Maths-

If the system of equations x-ky-z=0,kx-y-z=0,x+y-z=0 has a non-zero solution then the possible values of k are

For such questions, we should remember the requirement for non zero solution. We have to be careful when finding the determinant.

If the system of equations x-ky-z=0,kx-y-z=0,x+y-z=0 has a non-zero solution then the possible values of k are

Maths-General

For such questions, we should remember the requirement for non zero solution. We have to be careful when finding the determinant.

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