Question

Anti-Markovnikov’s addition of $HBr$ is not observed in:

• A. $\text{Pent-2-ene}$
• B. $\text{Propene}$
• C. $\text{But-2-ene}$
• D. $\text{But-1-ene}$

Answer 1

The correct option is C $\text{But-2-ene}$

In the presence of peroxide, addition of $HBr$ to unsymmetrical alkenes takes place contrary to the Markovnikov rule. In case of $\text{But-2-ene}(C{H}_{3}CH=CHC{H}_3)$ both double bonded carbons are identical. Therefore, it does not observe the anti-Markownikoff’s addition of$HBr$.