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Question: In which of the following, addition of \(HBr\) does not take place against Markownikoff's rule or An...

In which of the following, addition of HBrHBr does not take place against Markownikoff's rule or Anti-Markownikoff addition of HBrHBr is not observed for.

A

Propene

B

But-1-ene

C

But-2-ene

D

Pent-2-ene

Answer

But-2-ene

Explanation

Solution

CH3−CH=CH−CH3+HBr→PeroxideCH_{3} - CH = CH - CH_{3} + HBr\overset{\quad\text{Peroxide}\quad}{\rightarrow}

CH_{3} - CH_{2} - \underset{|}{C}H - CH_{3} \\ Br \end{matrix}}$$ Anti-markownikoff’s rule is not applicable to symmetrical alkenes.