Chemistry Carboxylic Acids UHS 2022
PMDC Verified Question 42 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 A and B
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:

According to IUPAC priority rules, the carboxylic acid group (\( -\text{COOH} \)) holds the highest priority among common functional groups, thereby commanding the suffix of the molecule.

Solution:

  • Because the carboxylic acid governs the parent name, the molecule will end in the suffix "-oic acid".


  • The ketone group (\( >\text{C=O} \)) is consequently downgraded to a mere substituent.


  • As a prefix substituent, the ketone oxygen is denoted by the term "oxo-".


  • Therefore, the naming format is "...oxo...oic acid".


Why other options are incorrect:

The suffix "-one" is strictly reserved for when a ketone is the highest priority group in the molecule, which is never the case when an acid is present.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

Previous Question All Carboxylic Acids MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App