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

Question

Anti-Markovnikov’s addition of HBr is not observed in (A) propene (B) 1-butene (C) but-2-ene (D) pent-2-ene.

Tardigrade Admin · Accepted Answer

Anti-Markovnikov’s addtion of HBr is observed only with unsymmetrical alkenes, i.e., propene, 1-butene and pent-2-ene. Since 2-butene is symmetrical, therefore, antimarkovnikov’s addtion of HBr is not observed in this case.

Q. Anti-Markovnikov’s addition of HBr is not observed in

propene

1-butene

but-2-ene

pent-2-ene.

Anti-Markovnikov’s addtion of HBr is observed only with unsymmetrical alkenes, i.e., propene, 1-butene and pent-2-ene. Since 2-butene is symmetrical, therefore, antimarkovnikov’s addtion of HBr is not observed in this case.