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Which of the following statements are correct?

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a

The nucleophilic addition of HCN to ${CH}_{3} CH = CHCHO$ in a major addition to C = C

b

The nucleophilic addition of HCN to ${CH}_{3} CH = CHCHO$ results in a major addition to C = O

c

The nucleophilic addition of PhMgBr or PhCH = CH – CHO results in addition to C = C

d

The nucleophilic addition of PhMgBr or PhCH = CH - ${COCMe}_{3}$ results in addition to C = C

answer is A.

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Detailed Solution

The formation of the product (a) can be explained by the fact that C = O is a stronger bond the C = C, and so the preferential addition is to C = C. In the formation of the product (c), steric hindarance is a major factor. However, in a case of (d) , the inductive effect of Me group is a major factor, in addition to steric hindrance

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Which of the following statements are correct?