Question

Anti-Markovnikov addition is not observed in:

• A. Propene
• B. But-1-ene
• C. But-2-ene
• D. Pent-2-ene

Answer 1

The correct option is C But-2-ene

As we know, in the presence of peroxide, addition of $HBr$ to unsymmetrical alkenes like propene takes place contrary to the Markovnikov rule. In case of symetrical alkenes this rule is not applicable. But-2-ene is the symmetrical alkene among the given alkenes. Hence, anti-Markovnikov addition is not observed in But-2-ene $C{H}_3-CH=CH-C{H}_3$.