Question

The increasing order of the rate of HCN addition to compounds A-D is :
(A) HCHO
$(B)CH_{3} COCH_{3}$
$\left(C\right)phCOCH_{3}$
$\left(D\right)phcoph$

• A. $A<\, B<\, C<\, D$
• B. $D<\, B<\, C<\, A$
• C. $D<\, C<\, B<\, A$
• D. $C<\, D<\, B<\, A$

Answer 1

Answer: (C)

Addition of HCN is nucleophilic addition. Greater the electron deficiency of carbonyl group higher the rate of reaction.
Hence,