Correct Answer - D
The carbonyl compounds undergo nucleophilic addition reaction because oxygen is more electronegative than carbon. As such, it withdraws shared `pi`-electron pair towards itself and gets partial negative charge, therefore carbon get partial positive charge and becomes susceptible to nucleophilic attack.
Aldehydes are more reactive than ketones towards nucleophiles is based upon the positive charge
Present on carbon atom of
group, in aldehdye
group is present with at least one lakyl group (except formaldehyde) which has +I-effect (electron donating effect) and which decreases the positive charge of carbon, thereby making the attack to nucleophile difficult. the nucleophilic attack becomes more difficult in ketones having minimum of two alkyl groups.
Hence, by means of attachment of alkyl groups (due to +I-effect) rate of nucleophilic addition decreases. That means `e^(-)` density at C-atom decreases Order of +I-effect in alkyl group
Order of nucleophilic addtion in given carbonyl compound is
`CH_(3) CHO gt CH_(3) -CH_(2)-CHO gt (CH_(3))_(2) CO gt CH_(3)-CH_(2)-CH_(2)-overset(O)overset(||)(C)-CH_(3)`
