A) benzaldehyde
B) \[p-\]nitrobenzaldehyde
C) phenylacetaldehyde
D) \[p-\]hydroxybenzaldehyde
Correct Answer: B
Solution :
Addition of \[HCN\] to a carbonyl compound is a nucleophilic addition reaction. \[-N{{O}_{2}}\] group being electron withdrawing increases the polarity (or electron deficiency) of carbonyl carbon and thus, makes the \[>C=O\] group of behzaldehyde more reactive towards\[HCN\].
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