According to IUPAC system of nomenclature, the correct priority order of various functional groups is

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-CN > -CHO > -CO- > -OH

-CN > -CONH2 > -CO- > -NH2

-CHO > -COOH > -COX > -OH

-COOH > -CHO > -NH2 > -OH

answer is A.

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Detailed Solution

Correct priority order of functional groups (IUPAC) :-COOH > acid derivatives (-COOR > -COX > -CONH2) > -CN > -CHO > -CO- > -OH > -NH2

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