In IUPAC nomenclature, the correct order of decreasing priority of functional group is :

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In IUPAC nomenclature, the priority of the given functional groups is:

$- CON H_{2} > - C H O >> C = O > - N H_{2} > - C \equiv C -$ Amide (-CONH₂) has the highest priority among these.

Aldehyde (-CHO) has higher priority than ketone (>C=O).

Ketone (>C=O) has higher priority than amine (-NH₂).

Alkyne (-C≡C-) has the lowest priority because multiple bonds are considered after principal functional groups.

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