Question

In IUPAC names the correct order of decreasing priority of functional groups is:

• A. \(-CONH_2>C=O>-CHO>-NH_2>-C \equiv C-\)
• B. \(-CONH_2>-COOCH_3>-CHO>-NH_2>-OH\)
• C. \(-CONH_2>-CHO>C=O>-NH_2>-C \equiv C-\)
• D. \(-CONH_2>-CHO>-CN>-NH_2>-C \equiv C-\)

Answer 1

The Correct Option is D

Concept: According to IUPAC priority rules for functional groups (decreasing order): \[ \text{Carboxylic acid}>\text{ester}>\text{amide}>\text{nitrile}>\text{aldehyde}>\text{ketone}>\text{alcohol}>\text{amine}>\text{alkene}>\text{alkyne} \]
Step 1:Identify relative priorities} Among the given groups: \[ -CONH_2 \ (\text{amide}) \] \[ -CHO \ (\text{aldehyde}) \] \[ -CN \ (\text{nitrile}) \] \[ -NH_2 \ (\text{amine}) \] \[ -C \equiv C- \ (\text{alkyne}) \]
Step 2:Arrange decreasing priority} \[ -CONH_2>-CHO>-CN>-NH_2>-C \equiv C- \] Thus option (D) is correct. \[ \boxed{-CONH_2>-CHO>-CN>-NH_2>-C \equiv C-} \]