MHT CET 2021 Chemistry Solved Paper

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Aldehydes are readily oxidised to yield carboxylic acids but ketones are inert to oxidation. Which is the most likely explanation regarding this difference in reactivity?

Aldehydes have a proton attached to the carbonyl that is abstracted during oxidation. Ketones lack this proton and so, cannot oxidised.
Reducing agents like HNO3 are sterically hindered by ketone's carbonyl carbon.
Aldehydes and ketones are of similar hybridisation.
The rate of the forward oxidation reaction is equal to the rate of the reverse reduction reaction in ketones.

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