Question:
Which of the following order is correct for priority of functional group in IUPAC nomenclature?
Which of the following order is correct for priority of functional group in IUPAC nomenclature?
Updated On: Apr 3, 2026
- (1) –CHO > –COOR > –CO– > –CN > ≡ > –NH$_2$
- (2) –CONH$_2$ > –CN > –CHO > –CO– > –NH$_2$ > ≡
- (3) –CONH$_2$ > –COOR– > –CN > –CHO > –CO– > ≡
- (4) –COOR > –CN > –CONH$_2$ > –CHO > –CO– > ≡
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The Correct Option is B
Solution and Explanation
IUPAC has a set priority order for choosing the principal functional group in a polyfunctional organic compound.
1. Standard Priority List (Decreasing):
Carboxylic acids > Sulfonic acids > Anhydrides > Esters (–COOR) > Acid halides > Amides (–CONH$_2$) > Nitriles (–CN) > Aldehydes (–CHO) > Ketones (–CO–) > Alcohols > Amines (–NH$_2$) > Alkenes (=) > Alkynes (≡).
2. Compare with options:
Option (2): \(\text{Amide } > \text{ Nitrile } > \text{ Aldehyde } > \text{ Ketone } > \text{ Amine } > \text{ Alkyne}\).
This follows the standard order perfectly.
Option (2) is correct.
1. Standard Priority List (Decreasing):
Carboxylic acids > Sulfonic acids > Anhydrides > Esters (–COOR) > Acid halides > Amides (–CONH$_2$) > Nitriles (–CN) > Aldehydes (–CHO) > Ketones (–CO–) > Alcohols > Amines (–NH$_2$) > Alkenes (=) > Alkynes (≡).
2. Compare with options:
Option (2): \(\text{Amide } > \text{ Nitrile } > \text{ Aldehyde } > \text{ Ketone } > \text{ Amine } > \text{ Alkyne}\).
This follows the standard order perfectly.
Option (2) is correct.
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