The pair of molecules that are metamers among the following is :

Step-by-step solution

Metamerism is a type of structural isomerism where isomers have the same molecular formula but differ in the nature of the alkyl groups attached to the same polyvalent functional group (such as - O - , - S - , - NH - , - CO - ). In option (1), CH ₃ CH ₂ CH ₂ OH and CH ₃- CH(OH) - CH ₃ are position isomers because the position of the - OH group differs. In option (2), CH ₃ CH ₂ CH ₂ CH ₂ CH ₃ and ( CH ₃)₂ CHCH ₂ CH ₃ are chain isomers because the carbon skeleton differs. In option (3), H ₃ C - CO - CH ₃ and H ₃ C -