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Preparation of Alkyl Halides

CH 2= CH - NO...

Question

$C H_{2} = C H - N O_{2} + H B r \to P$ ; The major product $^{'} P^{'}$ is:

A

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B

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C

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D

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Solution

The correct option is A
When 1-Nitroethene, $C H_{2} = C H - N O_{2}$ , is reacted with hydrogen bromide $(H B r)$ , the product formed is $B r - C H_{2} - C H_{2} - N O_{2}$ .

This reaction does not follow Markovnikov addition .
Due to the presence of the nitro group , the positive charge is developed on the second carbon. So, the bromide ion goes for the second carbon and the hydrogen cation goes to the first carbon attached to the nitro group .

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