A = AcetaldehydeB = AcetoneC = Di-tert-butyl ketoneD = Methyl tert -butyl ketone Decreasing order of reactivity towards HCN is

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A > B > C > D

C > D > B > A

A > B > D > C

C > B > A > 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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