Identify the correct statements from the following

Choose the correct answer from the options given below

To determine which of the given statements are correct, we analyze the structural relationship between each pair of compounds.

For Statement A, both compounds are ketones with the molecular formula $$C_5H_{10}O$$. The first compound is pentan-2-one, while the second is pentan-3-one. Metamerism arises when compounds possess the same functional group but differ in the nature of the alkyl groups attached to the functional group. In pentan-2-one, the carbonyl group is attached to methyl and propyl groups, whereas in pentan-3-one it is attached to two ethyl groups. Hence, these compounds are metamers, making Statement A true.

For Statement B, the first compound is a nitrile ($$R-CN$$) and the second is an isonitrile ($$R-NC$$). They have the same molecular formula but differ in the connectivity of atoms and belong to different functional group classes. Therefore, they are regarded as functional isomers, making Statement B true.

For Statement C, the compounds are butan-1-ol and butan-2-ol. Both possess the same carbon skeleton and the same functional group, but the hydroxyl group is located at different positions on the carbon chain. Hence, they are position isomers, making Statement C true.

For Statement D, the first compound is a primary amine ($$CH_3CH_2CH_2NH_2$$) while the second is a secondary amine ($$CH_3CH_2NHCH_3$$). Homologous compounds must belong to the same homologous series and differ by one or more $$-CH_2-$$ units. Since these compounds belong to different classes of amines, they are not homologous, making Statement D false.

Therefore, based on standard chemical definitions:

• Statement A - True
• Statement B - True
• Statement C - True
• Statement D - False

Hence, the chemically correct set of statements is A, B, and C only, which corresponds to option D.