Answer:
This is attributed to the greater steric
hindrance by the two alkyl (or aryl) groups in ketones compared to one such
group in aldehydes to the attacking nucleophile. Moreover, these groups also
tend to increase the electron density on the carbonyl carbon more in ketones in
comparison to aldehydes. Ketones are therefore, less reactive than aldehydes in
the nucleophilic substitution reactions.
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