1.

The general order of reactivity of carbonyl compounds towards 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 gtH_(2)C = O`
`Ar_(2)C = O gt R_(2)C = O gt ArCHO gt RCHO gtH_(2)C = O`
`H_(2)C = O gt R_(2)C = O gt Ar_(2)C = O gt RCHO gt ArCHO`

Solution :Reactivity DECREASES the magnitude of positive charge on the carbonyl carbon decreases or the steric hindrance in the intermediate increases, hence the correct ORDER of reactivity of carbonyl compounds towards nucleophilic addition reaction is,
`H_(2)C=O gt RCHO gt ArCHO gt R_(2)C=O gt Ar_(2)C=O`


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