Which of the following statements are correct ?

Options

A. The nucleophilic addition of `HCN` to (I) results in major addition to `(C = O)`.
B. The nucleophilic addition of `HCN` to `(I)` results in major addition `(C = C)`
C. The nucleophilic addition of `PhMgCl` to (II) results of 1,4-addition.
D. The nucleophilic addition of `PhMgCl` to (III) results in addition to `(C = C)`.

Answer

B, C, D

Explanation

For the explanation of reaction (a) and (b) : `(C = O)` is stronger bond than `(C = C)`, and thus the preferential addition is to `(C = C)`. So (b) is correct.

For reaction (d) :
Due to steric hinderence and `+ I` effect of three `(Me)` groups, the reactivity of the `(C = O)` group is decreased and hence the reaction occurs at `(C = C)` bond.