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Introduction to Electrophilic Substitution

The addition ...

Question

The addition of $H B r$ to an alkene in the presence of peroxide is an example of :

A

electrophillic addition reaction

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B

nucleophillic addition reaction

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C

free-radical addition reaction

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D

formation of carbocation as an intermediate

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Solution

The correct option is C free-radical addition reaction
Addition reaction of $H B r$ to an alkene in the presence of peroxide follows the free-radical mechanism. Here, bromine radical is formed which reacts with an alkene and produces an anti-markovnikov product.

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Q. During the addition of

H B r

in presence of a radical initiator peroxide, to an alkyne, the product, bromoalkene does not undergo an addition reaction with

H B r

till all alkyne are exhausted, though alkene is more reactive than alkyne towards free radical addition reaction, explain.

Q. Identify the incorrect statement/statements :
(i) Alkynes are more reactive than alkenes towards electrophilic addition reaction
(ii) Alkynes are less reactive than alkenes towards electrophilic addition reaction
(iii) Alkynes decolourise

B r_{2}

water
(iv) Addition of

H B r

to alkenes in presence of peroxide proceeds via Markovnikov's rule

Q. Identify the incorrect statement/statements :
(i) Alkynes are more reactive than alkenes towards electrophilic addition reaction
(ii) Alkynes are less reactive than alkenes towards electrophilic addition reaction
(iii) Alkynes decolourise

B r_{2}

water
(iv) Addition of

H B r

to alkenes in presence of peroxide proceeds via Markovnikov's rule

Q. Addition of cold concentrated

H_{2} S O_{4}

with alkene is an example of

Peroxide effect of addition of HBr to an alkene occurs through a stable:

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