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General
Easy
Question
Homolytic bond fission of a covalent single bond gives rise to free radicals. Owing to the presence of an odd electron, free radicals are highly reactive. They have planar to pyramidal geometry depending upon the groups attached to the C-atom having odd electron. Alkyl free radicals are stabilised by hyperconjugation whereas allyl and benzyl free radicals are stabilised by resonance. They are formed as intermediates in the reaction mixture either in the gaseous phase or in non-polar solvents. Addition of HBr to alkenes in presence of peroxide, the substitution of allylic or benzylic hydrogen by ‘Cl’ at high temperature or by ‘Br’ in presence of NBS are examples of reactions involving free radical intermediates.
Arrange the following free radicals in the decreasing order of their stability. 
The correct answer is:
Related Questions to study
chemistry-
Homolytic bond fission of a covalent single bond gives rise to free radicals. Owing to the presence of an odd electron, free radicals are highly reactive. They have planar to pyramidal geometry depending upon the groups attached to the C-atom having odd electron. Alkyl free radicals are stabilised by hyperconjugation whereas allyl and benzyl free radicals are stabilised by resonance. They are formed as intermediates in the reaction mixture either in the gaseous phase or in non-polar solvents. Addition of HBr to alkenes in presence of peroxide, the substitution of allylic or benzylic hydrogen by ‘Cl’ at high temperature or by ‘Br’ in presence of NBS are examples of reactions involving free radical intermediates.
3, 5–dimethylcyclopentene reacts with N–bromosuccinimide (NBS) in CCl4 in presence of light or peroxide. Identify the product.
Homolytic bond fission of a covalent single bond gives rise to free radicals. Owing to the presence of an odd electron, free radicals are highly reactive. They have planar to pyramidal geometry depending upon the groups attached to the C-atom having odd electron. Alkyl free radicals are stabilised by hyperconjugation whereas allyl and benzyl free radicals are stabilised by resonance. They are formed as intermediates in the reaction mixture either in the gaseous phase or in non-polar solvents. Addition of HBr to alkenes in presence of peroxide, the substitution of allylic or benzylic hydrogen by ‘Cl’ at high temperature or by ‘Br’ in presence of NBS are examples of reactions involving free radical intermediates.
3, 5–dimethylcyclopentene reacts with N–bromosuccinimide (NBS) in CCl4 in presence of light or peroxide. Identify the product.
chemistry-General
chemistry-
When isobutene is brominated, the percentage of 
would be approximately
When isobutene is brominated, the percentage of would be approximately
chemistry-General
chemistry-
What is (B) in the following sequence of reactions?
What is (B) in the following sequence of reactions?
chemistry-General
chemistry-
The major product obtained in the acid catalysed dehydration of 
would be 
is
The major product obtained in the acid catalysed dehydration of would be is
chemistry-General
chemistry-
Identify (b) in the following sequence of reactions.
Identify (b) in the following sequence of reactions.
chemistry-General
chemistry-
The appropriate reagent for the following transformation is
The appropriate reagent for the following transformation is
chemistry-General
chemistry-
Major product of the reaction, 
would be
Major product of the reaction, would be
chemistry-General
physics-
A hollow sphere of mass M and radius r is immersed in a tank of water (density 
). The sphere would float if it were set free. The sphere is tied to the bottom of the tank by two wires which makes angle 
with the horizontal as shown in the figure. The tension T1 in the wire is :
A hollow sphere of mass M and radius r is immersed in a tank of water (density ). The sphere would float if it were set free. The sphere is tied to the bottom of the tank by two wires which makes angle with the horizontal as shown in the figure. The tension T1 in the wire is :
physics-General
physics-
An ideal monoatomic gas is carried around the cycle ABCDA as shown in the figure. The efficiency of the gas cycle is :
An ideal monoatomic gas is carried around the cycle ABCDA as shown in the figure. The efficiency of the gas cycle is :
physics-General
physics-
The following graphs shows two isotherms for a fixed mass of an ideal gas. The ratio of r.m.s. speed of the molecules at temperatures T1 and T2 is
The following graphs shows two isotherms for a fixed mass of an ideal gas. The ratio of r.m.s. speed of the molecules at temperatures T1 and T2 is
physics-General
chemistry-
A hydrocarbon of formula 
absorbs only one molecule of H2 upon catalytic hydrogenation. Upon ozonolys is, the hydrocarbon yields.
The hydrocarbon is
A hydrocarbon of formula absorbs only one molecule of H2 upon catalytic hydrogenation. Upon ozonolys is, the hydrocarbon yields.
The hydrocarbon is
chemistry-General
physics-
A volume (V)-temperature (T) diagram was obtained when a given mass of gas was heated. During the heating process from state 1 to state 2, the pressure :
A volume (V)-temperature (T) diagram was obtained when a given mass of gas was heated. During the heating process from state 1 to state 2, the pressure :
physics-General
physics-
The distribution of relative intensity I(l) of blackbody radiation from a solid body versus the wavelength l is shown in the figure. If the Wien displacement law constant is 
m K, what is the approximate temperature of the object?
The distribution of relative intensity I(l) of blackbody radiation from a solid body versus the wavelength l is shown in the figure. If the Wien displacement law constant is m K, what is the approximate temperature of the object?
physics-General
physics-
Five rods of same material and same length are joined as shown. Cross-section of rods ab, ad and bc are A, 2A and 3A respectively. Ends a and c are maintained at temperatures 200°C and 0°C respectively.
If x has the value calculated in above question. Then temperature of junction b or d is:
Five rods of same material and same length are joined as shown. Cross-section of rods ab, ad and bc are A, 2A and 3A respectively. Ends a and c are maintained at temperatures 200°C and 0°C respectively.
If x has the value calculated in above question. Then temperature of junction b or d is:
physics-General
physics-
Five rods of same material and same length are joined as shown. Cross-section of rods ab, ad and bc are A, 2A and 3A respectively. Ends a and c are maintained at temperatures 
C and 
C respectively.
For what cross-section x of rod dc there will be no heat flow through rod bd.
Five rods of same material and same length are joined as shown. Cross-section of rods ab, ad and bc are A, 2A and 3A respectively. Ends a and c are maintained at temperatures C and C respectively.
For what cross-section x of rod dc there will be no heat flow through rod bd.
physics-General
