Chemistry Fundamental Principles of Organic Chemistry NUMS 2022
PMDC Verified Question 50 of 83
Geometric isomerism is exhibited by:
A
Alcohol
B
Alkynes
C
Ethers
D
Alkenes
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Alkenes
Concept:

Geometric isomerism requires restricted rotation around a bond so that groups can be fixed in space relative to one another.

Solution:

  • Alkenes contain a carbon-carbon double bond (pi bond) that restricts free rotation.


  • If each carbon of the double bond has two different substituents attached, it will exhibit geometric (cis-trans) isomerism.


Why other options are incorrect:

Alcohols and ethers typically have only single bonds which undergo free rotation. Alkynes possess a linear geometry around the triple bond (sp hybridization), leaving no spatial variability for substituents.

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