Correct Answer: A
Explanation:
The metamerism arises when different alkyl groups are attached to same functional group. e.g., The following metamers contain the ether functional group. However they differ by the nature of alkyl groups attached to the oxygen atom.
Diethyl ether : methyl propyl ether : isopropyl methyl ether
Or : or : or
Ethoxyethane : 1-methoxypropane : 2-methoxypropane