Answer:
Aldehydes are more reactive than ketones
due to the following two reasons :
(i) Due to smaller \[+I\]-effect of one
alkyl group in aldehydes as compared to larger \[+I\]-effect of two alkyl groups,
the magnitude of positive charge on the carbonyl carbon is more in aldehydes
than in ketones. As a result, nucleophilic addition reactions occur more
readily in aldehydes than in ketones.
(ii) Due to presence of a H-atom
on the carbonyl group, aldehydes can be more easily oxidised than ketones. As a
result, aldehydes act as reducing agents and thus reduce Tollens' reagent,
Fehling's solution, etc.
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