Question

Identify A and B in the following chemical reaction:

• A.
• B.
• C.
• D.

Answer 1

The correct option is D

$HCl$ gives an addition reaction with the alkene. The $C{l}^{-}$ part of $HCl$ adds to that position of double bond which forms a stable carbocation on hetrolytic cleavage. Since the carbocation formed at the position near to the $-OC{H}_3$ group is more stable due to the $+M$ effect of $-OC{H}_3$ group hence $C{l}^{-}$ adds to that part only to give the major product $A.$ $NaI$ in dry acetone gives an $S_{N}2$ reaction and thus $I^{-}$ nucleophile attacks the carbon atom containing $Cl$ leaving group to give major product $B.$