Chemistry Fundamental Principles of Organic Chemistry MDCAT 2017
PMDC Verified Question 70 of 83
The type of structural isomerism which arises due to the difference in the nature of carbon chain or carbon skeleton is:
A
Chain isomerism
B
Cis-Trans isomerism
C
Position isomerism
D
Optical isomerism
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Chain isomerism
Concept:

Isomerism caused by a rearrangement of the carbon skeleton (straight vs. branched chains) while maintaining the same molecular formula is explicitly defined as chain isomerism (or skeletal isomerism).

Solution:

  • The question stem directly defines the phenomenon: difference in the nature of the carbon chain.


  • Examples include n-butane (straight chain) and isobutane (branched chain).


Why other options are incorrect:

Position isomerism involves moving a functional group. Cis-trans and optical isomerism are stereoisomerisms (spatial differences), not structural skeleton changes.

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