Chemistry Fundamental Principles of Organic Chemistry DUHS 2023
PMDC Verified Question 30 of 83
Which type of isomerism can propanal and acetone exhibit?
A
Functional group isomerism
B
Chain isomerism
C
Position isomerism
D
Metamerism
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Functional group isomerism
Concept:

Aldehydes and ketones with the same number of carbon atoms are functional group isomers because they share the same general molecular formula \( \text{C}_n\text{H}_{2n}\text{O} \).

Solution:

  • Propanal: \( \text{CH}_3\text{-CH}_2\text{-CHO} \) (Aldehyde functional group). Formula: \( \text{C}_3\text{H}_6\text{O} \).


  • Acetone (Propanone): \( \text{CH}_3\text{-CO-CH}_3 \) (Ketone functional group). Formula: \( \text{C}_3\text{H}_6\text{O} \).


  • Because they have identical molecular formulas but belong to completely different functional families, they exhibit functional group isomerism.


Why other options are incorrect:

They do not have the same functional group, ruling out position and chain isomerism.

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 Fundamental Principles of Organic Chemistry 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