Chemistry Carboxylic Acids UHS 2023
PMDC Verified Question 20 of 94
If carboxylic acid and ketone groups \( \text{C=O} \) are present in a chain, then final name will be given as
A
oxo, oic acid
B
one, oic acid
C
Both 1 and 2
D
None of these
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: oxo, oic acid
Concept:

When multiple functional groups are present, IUPAC nomenclature dictates a strict priority order to determine the parent suffix. The carboxylic acid group is at the very top of this priority list.

Solution:

  • Because the carboxylic acid takes highest priority, the parent chain must end with the suffix "-oic acid".


  • All other groups, including the ketone, are relegated to being substituents.


  • As a substituent, the ketone group is designated by the prefix "oxo-".


  • Thus, the final naming pattern is "oxo...oic acid".


Why other options are incorrect:

The suffix "-one" can only be used if the ketone is the highest priority group in the entire molecule, which is impossible if an acid is present.

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