# Which of the following classes of organic compounds show metamerism

$(a)\;Ethers \\(b)\;2^{\circ}Amines\\(c)\;Thioethers \\(d)\;All\;of\;three$

Pls ans  this  question

Compounds having the same molecular formula but different number of carbon atoms or different alkyl groups on eiher side of the functional group (ie $-O,-SH-, -NH-)$ are called metamers and the phenomenon is called metamerism.
Hence d is the correct answer.