Question

The alkene that will give the same product with $HBr$ in the absence as well as in the presence of peroxide is?

• A. $2-$butene
• B. $1-$butene
• C. propene
• D. $1-$hexene

Answer 1

Answer: (A)

$2-$butene

$2-butene$ is a symmetrical alkene so it gives the same product with $HBr$ in the absence as well as in the presence of peroxide due to addition of $Br$ at the same position (C=C bond) in accordance with markovnikov's rule in both the conditions that is in the absence as well as in the presence of peroxide.

hence the correct option is A.