Which of the following classes of organic compounds show metamerism?

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Ethers

Secondary amines

Ketones

Any of the three

answer is D.

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Detailed Solution

Metamerism is a phenomenon in which two or more organic compounds have the same molecular formula but differ in the arrangement of atoms in their carbon chain.
All the compounds ethers, secondary amines, and ketones show metamerism.
Ethers have the general formula R-O-R', where R and R' are alkyl or aryl groups.
Depending on the nature of the alkyl or aryl groups, different isomeric ethers can be formed, which exhibit metamerism.
For example, dimethyl ether and ethyl methyl ether have the same molecular formula (C₂H₆O) but different structures.
Secondary amines have the general formula R₂NH, where R is an alkyl or aryl group.
Depending on the nature and arrangement of the alkyl or aryl groups, different isomeric secondary amines can be formed, which exhibit metamerism.
For example, diethylamine and ethylmethylamine have the same molecular formula (C₄H₁₁N) but different structures.
Ketones have the general formula $R - \underset{| |}{C} - R^{'} O$ .
Depending on the nature and arrangement of the alkyl or aryl groups, different ketones can be formed, which exhibit metamerism.
For example, 2-pentanone and 3-pentanone have same molecular formula (C₅H₁₀O) but different structures.