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Introduction to Alkenes

Electrophilic...

Question

Electrophilic addition on a carbon-carbon double bond involves the intermediate formation of a more stable carbocation. This statement is called

A

Saytzeff's rule

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B

Baeyer's effect

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C

Markownikoff's rule

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D

None of these

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Solution

The correct option is C Markownikoff's rule
Markovnikov's rule is widely used to predict products formed in addition reactions involving unsaturated hydrocarbons.

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Electrophilic addition on a carbon-carbon double bond involves the intermediate formation of a more stable carbocation. This statement is called

Q. Assertion :Alkenes usually undergo electrophilic addition reaction at carbon-carbon double bond. Reason: Electrophilic addition at double bond produces carbocation intermediate.

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. Assertion :Methanol cannot be prepared by the hydration of an alkene. Reason: Hydration of alkenes is electrophilic addition reaction. Alkenes when treated with dil. sulfuric acid form alcohol by Markonikov's rule and the protonation gives more stable carbocation and the minimum number carbons required is two.

STATEMENT-1: Phenol is more reactive than benzene towards electrophilic substitution.
STATEMENT-2: In the case of Phenol, the intermediate carbocation is more resonance stabilized.

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