Correct order of priority of various functional groups according to IUPAC nomenclature is

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–COOH > –CHO > –CN > –CO –

–COOH > –CN > –OH > –NH2

–CHO > –OH > –Cl > –NH2

–COOH > -OH > –CN > –CO –

answer is B.

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Detailed Solution

–COOH>–SO3H>–COX>–COOR>–CONH2> –CN>–CHO>–CO–>–OH>–NH2> double bond>triple bond>Substituents(–X,–NO2,–R)

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