The general order of reactivity of carbonyl compounds for nucleophilic addition reactions is -

Options

A. `H_2C=O gt RCHO gt ArCHO gt R_2C=O gt Ar_2C=O`
B. `ArCHO gt Ar_2C=O gt RCHO gt R_2C=O gt H_2C=O`
C. `Ar_2C=O gt R_2C=O gt ArCHO gt RCHO gt H_2C=O`
D. `H_2C=O gt R_2C=O gt Ar_2C=O gt RCHO gt ArCHO`

Answer

A

Explanation

The size of the alkyl group, causes hindrance to attacking group. As the number and size of the alkyl groups increase the hindrance to the attack of nucleophile also increases.
Thus the reactivity follows the order
`H_2C = O gt RCHO gt ArCHO gt R_2C = O gt Ar_2C = O`.