Question

what are the products obtained by addition reaction of HBr to hex 1-ene

(i) in the absence of peroxide

(ii) in the presence of peroxide

Answer 1

In absence the product is 2-bromohexane.
In presence the product is 1- bromohexane.
See photo also.
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Answer 2

Explanation:

i) Addition of the hydrogen bromide will be according to the anti- Markovnikov's rule: According to which negative part of the polar reagent adds to the carbon of double with more number hydrogen atoms.

$C_4H_9CH=CH_2+HBr\overset{peroxide}\rightarrow C_4H_9CH_2-CH_2Br$

ii) Addition of the hydrogen bromide will be according to the Markovnikov's rule: According to which positive part of the polar reagent adds to the carbon of double with more number hydrogen atoms.

$C_4H_9CH=CH_2+HBr\rightarrow C_4H_9CHBr-CH_3$