Which of the following is a pair of metamers?

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(A) Metamerism arises due to the difference in the nature of alkyl groups attached to the same polyvalent functional group.$A$: Pentan$-2-$one $(CH_3-

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Pentan$-2-$one and Pentan$-3-$one

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(A) Metamerism arises due to the difference in the nature of alkyl groups attached to the same polyvalent functional group.$A$: Pentan$-2-$one $(CH_3-CO-CH_2-CH_2-CH_3)$ and Pentan$-3-$one $(CH_3-CH_2-CO-CH_2-CH_3)$. Here,the ketone group is the same,but the alkyl groups attached to it are different ($CH_3, C_3H_7$ vs $C_2H_5, C_2H_5$). Thus,they are metamers.$B$: These are functional isomers (ester vs ester,but different connectivity).$C$: These are positional isomers.$D$: These are positional isomers.Therefore,the correct pair of metamers is $A$.

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