Chemistry Fundamental Principles of Organic Chemistry MDCAT 2011
PMDC Verified Question 82 of 83
1-chloropropane and 2-chloropropane are isomers of each other. The type of isomerism is:
A
Cis-trans isomerism
B
Chain isomerism
C
Positional isomerism
D
Functional group isomerism
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Positional isomerism
Concept:

Structural isomers that have the same carbon skeleton but differ in the position of the functional group or substituent are called positional isomers.

Solution:

  • In 1-chloropropane (\( \text{CH}_3\text{CH}_2\text{CH}_2\text{Cl} \)), the chlorine atom is attached to carbon-1.


  • In 2-chloropropane (\( \text{CH}_3\text{CH}(\text{Cl})\text{CH}_3 \)), the chlorine atom is attached to carbon-2.


  • Because the carbon chain remains exactly the same (propane) and only the position of the chloro-substituent changes, this is positional isomerism.


Why other options are incorrect:

They are not chain isomers because the main chain length is identical. They are not functional isomers because the functional group (halide) remains the same.

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