Chemistry Aldehydes & Ketones DUHS 2022
PMDC Verified Question 35 of 94
Acetone gives:
A
Fehling solution test positive
B
Silver mirror test positive
C
Lucas test positive
D
Iodoform test positive
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Iodoform test positive
Concept:

Acetone (propanone) is a ketone and exhibits chemical properties distinct from both aldehydes and alcohols.

Solution:

  • Acetone has the structure \( CH_3-CO-CH_3 \).


  • Because it contains a methyl group directly bonded to the carbonyl carbon (\( CH_3-CO- \)), it readily undergoes the haloform reaction.


  • When treated with iodine and base, it yields a yellow precipitate of iodoform (\( CHI_3 \)), making it Iodoform test positive.


Why other options are incorrect:

Ketones strongly resist oxidation and will not give a positive Fehling's (A) or Silver Mirror (B) test. The Lucas test (C) is strictly for differentiating primary, secondary, and tertiary alcohols, not ketones.

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 Aldehydes & Ketones 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