Q.

The addition of HBr to butadiene at -80°C produces

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a

3-bromobut-1-ene

b

1-bromobut-2-ene

c

a mixture of 3-bromobut-1-ene and 4-bromobut-1-ene

d

4-bromobut-1-ene

answer is A.

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Detailed Solution

The addition of HBr to butadiene at -80°C produce is 3-bromobut-1-ene.

Alkyl halides are produced by adding HBr to alkenes. The pi bond of the alkene functions as a weak nucleophile and interacts with the electrophilic proton of HBr, which is a helpful way to conceptualize the reaction. 

Hence, option A is correct. 

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