Addition of HBr to 2-pentene gives

1.	Addition of HBr to 2-pentene gives
Answer» 2-bromopentane only 3-bromopentane only 2-bromopentane and 3-bromopentane 1-bromopentane and 3-bromopentane Solution :Addition of a proton to 2-pentene can give two CARBOCATIONS (I and II) which are almost equally stable since CARBOCATION (I) is stabilized by five (3+2) HYPERCONJUGATION structures and carbocation (II) is stabilized by FOUR (2+2) hyperconjugation structures . Therefore , nucleophilic ATTACK on these gives the coresponding bromoalkanes in almost equal amounts . Of course , the yield of 2-bromopentane will be slightly more than that of 3-bromopentane.

Discussion