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The correct option is D Ketones < Aldehydes < Nitriles < Esters < Carboxylic acids When more than one functional group is present in a compound, then the functional group with most priority is used as a suffix whereas other functional groups present in the compound are used as prefix.
The order of priority is Ketones < Aldehydes < Nitriles < Esters < Carboxylic acids.
Generally, the functional group which shows its characteristics more dominantly even when present with other groups gets a higher priority.