Concept:Metamerism is a type of isomerism where molecules have the same molecular formula but different alkyl groups attached to a polyvalent functional group (like oxygen in ethers).
Chemical Equation / Formula:The pair showing metamerism is:
CH3OCH2CH2CH3 and
CH3CH2OCH2CH3Explanation:In option D, both molecules are ethers with the same functional group
−O− but with different distribution of carbon atoms on either side.
The first ether has a methyl group on one side and a propyl group on the other side:
CH3−O−CH2CH2CH3.
The second ether has an ethyl group on each side:
CH3CH2−O−CH2CH3.
Since the alkyl chains attached to the oxygen are different, these two compounds are metamers.
Options A, B, and C show other types of isomerism (positional, chain, or stereoisomerism), not metamerism.
Answer:D
