1.

The general order of reactivity of carbonyl compounds for nucleophilic addition reaction is

Answer»

`H_(2)C = O gt RCHO gt ArCHO gt R_(2)C =O gt Ar_(2)C =O`
`ArCHO gt Ar_(2)C =O gt RCHO gt R_(2)C = O gt H_(2)C =O`
`Ar_(2)C = O gt R_(2)C =O gt ArCHO gt RCHO gt H_(2)C =O`
`H_(2)C = O gt R_(2)C = O gt Ar_(2)C = O gt RCHO gt ArCHO`

Solution :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 to nucleophile also increases. Thus the REACTIVITY follows the ORDER
`H_(2)C = O gt RCHO gt ArCHO gt R_(2)C = O gt Ar_(2)C = O`


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