Which of the following pairs of molecules represents metamers?

Step-by-step solution

Metamerism arises due to different alkyl chains on either side of a polyvalent functional group. Propan-1-amine and propan-2-amine differ in the position of the - NH ₂ group, making them position isomers. Butan-1-amine and 2-methylpropan-1-amine have different carbon skeletons, making them chain isomers. N-methylethanamine is a secondary amine, while propan-1-amine is a primary amine. They have different functional groups (secondary vs primary amine) and are functional isomers. N-ethylethanamine ( CH ₃ CH ₂- NH - C