NEET 2026 (Phase 1) · ChemistryPrevious Year Question
The pair of molecules that are metamers among the following is:
- A.$\ce{CH3CH2CH2OH}$ and $\ce{CH3-CH(OH)-CH3}$
- B.$\ce{CH3CH2CH2CH2CH3}$ and $\ce{(CH3)2CHCH2CH3}$
- C.$\ce{CH3CH2COOCH3}$ and $\ce{CH3COOCH2CH3}$
- D.$\ce{CH3OCH2CH2CH3}$ and $\ce{CH3CH2OCH2CH3}$✓
Correct Answer
(D) $\ce{CH3OCH2CH2CH3}$ and $\ce{CH3CH2OCH2CH3}$
Solution & Explanation
\textbf{Answer:} (d) \textbf{Solution:} Metamerism arises from different alkyl groups attached on either side of the same functional group (here, the ether oxygen). $\ce{CH3-O-CH2CH2CH3}$ (methyl propyl ether) and $\ce{CH3CH2-O-CH2CH3}$ (diethyl ether) have the same molecular formula $\ce{C4H10O}$ but different alkyl groups around oxygen, so they are metamers. Option (A) is functional/position isomerism (alcohols), (B) is chain isomerism (alkanes), and the esters in (C) are not metamers.
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