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Elimination Reactions of Alkyl Halides

The addition ...

Question

The addition of HBr to an alkene in the presence of peroxide is

A

A nucleophilic addition via an alkyl anion intermediate

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B

A electrophilic addition via an alkyl cataion intermediate

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C

A free radical addition via β- bromo alkyl radical intermediate

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D

A nucleophilic addition via α- bromo alkyl radical intermediate

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Solution

The correct option is C
A free radical addition via β- bromo alkyl radical intermediate

Anti markownikoff rule is by free radical mechanism

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Q. Assertion :Addition of halogens in dry condition to an alkene is regioselective i.e.devoid of any rearrangement. Reason: Addition of halogen at carbon-carbon double bond proceed via a cyclic harmonium ion intermediate.

Q. Identify the incorrect statement/statements :
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(iv) Addition of

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In the nucleophilic addition of CN^- to carbonyl carbon, the intermediate formed is

In the nucleophilic addition of CN^-1 to carbonyl compound the intermediate formed is

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

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Elimination Reactions of Alkyl Halides

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