A = Acetaldehyde
B = Acetone
C = Di-tert-butyl ketone
D = Methyl tert -butyl ketone
Decreasing order of reactivity towards HCN is

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C > D > B > A

C > B > A > D

A > B > D > C

A > B > C > D

answer is C.

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Detailed Solution

As number and size of alkyl groups attached to carbonyl groups increases +I effect and steric hindrance increases. Carbonyl carbon becomes less electrophilic,reactivity decreases.

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