Chemistry Fundamental Principles of Organic Chemistry SZABMU 2024
PMDC Verified Question 9 of 83
Which of the following exhibits geometric isomerism
A
1-propane
B
2-hydroxy propanoic acid
C
Butenedioic acid
D
2-butene
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 2-butene
Concept:

Geometric isomerism requires a rigid bond (like \( \text{C=C} \)) where both carbon atoms are attached to two different substituent groups.

Solution:

  • Option D (2-butene): Structurally \( \text{CH}_3\text{-CH=CH-CH}_3 \). Each carbon of the double bond is attached to a hydrogen atom and a methyl group. It perfectly exhibits cis-trans isomerism.


  • Note on Option C: Butenedioic acid (maleic/fumaric acid) also exhibits geometric isomerism. However, standard textbook examples frequently isolate 2-butene as the archetype, and the source answer key explicitly selects D.


Why other options are incorrect:

1-propane has no double bond. 2-hydroxypropanoic acid (lactic acid) exhibits optical isomerism (chiral center), not geometric.

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.

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