The order of reactivity of carbonyl compounds for nucleophillic addition is:

A r_{2} C = O > R_{2} C = O > A r C H O > R C H O > H_{2} C = O

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H_{2} C = O > R_{2} C = O > A r_{2} C = O > R C H O > A r C H O

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H_{2} C = O > R C H O > A r C H O > R_{2} C = O > A r_{2} C = O

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A r C H O > A r_{2} C = O > R C H O > R_{2} C = O > H_{2} C = O

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Solution

The correct option is C $H_{2} C = O > R C H O > A r C H O > R_{2} C = O > A r_{2} C = O$
With each substitution of hydrogen atom, reactivity of carbonyl compounds decrease. This is due to inductive effect in case of alkyl group and resonance effect in case of aromatic groups. Also, the rate increases if the carbonyl group is not sterically hindered by other groups. So the order is: $H_{2} C = O > R H C H O > A r H C H O > R_{2} C = O > A r_{2} C = O$

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