Maths-
General
Easy
Question
If first, fifth and last terms of an A.P. is l, m, p respectively and sum of the A.P. is 
- 2
- 3
- 4
- 5.
The correct answer is: 2
Let common difference = d and number of terms = n
Compare this with the given summation, we get K = 2.
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The sum of n terms of the series 
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is
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HBr reacts fastest with:
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Which one of the following alcohols reacts most readily with Lucas reagent?
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What is the product (A) in the following reaction?
What is the product (A) in the following reaction?
Chemistry-General
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A compound soluble in conc. 
' It does not decolourise bromine in 
but oxidised by chromic anhydride in aqueous within two seconds, turning orange solution to blue, green, and then opaque. The original compound is:
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Chemistry-General
Chemistry-
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.
This reaction is mainly given by those compounds which have atleast one hydrogen atom present at 
-hybrid carbon. Reactivity of -hybrid carbon depends on the reactivity of reaction intermediate. The relative rate of formation of alkyl radicals by a chlorine radical is :
Percentage yield of the product =
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.
Arrange decreasing order of reactivity of given compounds with NBS: (N-bromo succinimide)
I) 
II) 
III) 
IV) 
Select the correct answer from the codes given below:
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.
This reaction is mainly given by those compounds which have atleast one hydrogen atom present at -hybrid carbon. Reactivity of -hybrid carbon depends on the reactivity of reaction intermediate. The relative rate of formation of alkyl radicals by a chlorine radical is :
Percentage yield of the product =
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.
Arrange decreasing order of reactivity of given compounds with NBS: (N-bromo succinimide)
I)
II)
III)
IV)
Select the correct answer from the codes given below:
Chemistry-General
Chemistry-
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.
This reaction is mainly given by those compounds which have atleast one hydrogen atom present at -hybrid carbon. Reactivity of -hybrid carbon depends on the reactivity of reaction intermediate. The relative rate of formation of alkyl radicals by a chlorine radical is :
Percentage yield of the product =
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:
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.
This reaction is mainly given by those compounds which have atleast one hydrogen atom present at -hybrid carbon. Reactivity of -hybrid carbon depends on the reactivity of reaction intermediate. The relative rate of formation of alkyl radicals by a chlorine radical is :
Percentage yield of the product =
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:
Chemistry-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 
reaction. The rate limiting step is spontaneous dissociation of an alkyl halide to give a carbocation intermediate
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 reaction. The rate limiting step is spontaneous dissociation of an alkyl halide to give a carbocation intermediate
reaction is:
Chemistry-General
