Concept:Metamerism occurs when isomers have the same molecular formula but differ in the distribution of alkyl groups on either side of a polyvalent functional group (like an amine, ether, or ketone).
Solution:- The formula \( \text{C}_4\text{H}_{11}\text{N} \) represents a saturated amine.
- Secondary amines (\( \text{R--NH--R'} \)) are polyvalent.
- Possible structures include:
- Diethylamine: \( \text{CH}_3\text{CH}_2\text{--NH--CH}_2\text{CH}_3 \)
- Methylpropylamine: \( \text{CH}_3\text{--NH--CH}_2\text{CH}_2\text{CH}_3 \)
- Since the alkyl groups around the central \( \text{-NH-} \) change, it exhibits metamerism.
Why other options are incorrect:While it can show structural chain isomerism, among the given choices, metamerism is the distinct and most characteristic isomerism for polyvalent functional groups like amines.
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.