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The increasing order of the rate of addition to compound A to D is HCN
A) HCHO B) $CH 3 COCH 3$ C) $PhCOCH 3$ D) $PhCOPh$

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D<C<B<A

C<D<B<A

A<B<C<D

D<B<C<A

answer is A.

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Detailed Solution

Formaldehyde is a carbonyl and it has hydrogen atoms on both the sides and hence its stearic free. In option-D we can see that both sides phenyl groups are present and it will not allow the incoming group to attack fast.

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