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

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 > C H}_{2} C = O

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{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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Solution

The correct option is A $H_{2} C = O > R C H O > A r C H O > R_{2} C = O > {A r}_{2} C = O$
For more reactivity for nucleophilic addition, the carbonyl carbon should be more electron deficient. Presence of $- R -$ or $- A r$ groups decrease this electron deficiency. More these groups present, less is the reactivity.

Hence, the required order is:
$H_{2} C = O > R C H O > A r C H O > R_{2} C = 0 > A r_{2} C = 0$

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