Question:
The pair of molecules that are isomers among the following is:
The pair of molecules that are isomers among the following is:
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Isomers have the same molecular formula but different structural arrangement.
Updated On: May 4, 2026
- \(\ce{CH3OCH2CH2CH3}\) and \(\ce{CH3CH2OCH2CH3}\)
- \(\ce{CH3CH2CH2CH3}\) and \(\ce{CH3CH2OCH3}\)
- \(\ce{CH3COCH3}\) and \(\ce{CH3CH2CHO}\)
- \(\ce{CH3CH2CH2OH}\) and \(\ce{CH3CH2COOH}\)
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The Correct Option is A
Solution and Explanation
Step 1: Understand isomerism.
Isomers are compounds having the same molecular formula but different structures. That means: \[ \text{Same molecular formula} \] but: \[ \text{Different arrangement of atoms}. \]
Step 2: Find the molecular formula of the first compound.
The first compound is: \[ \ce{CH3OCH2CH2CH3} \] Counting atoms: \[ C=4,\quad H=10,\quad O=1 \] So its molecular formula is: \[ \ce{C4H10O} \]
Step 3: Find the molecular formula of the second compound.
The second compound is: \[ \ce{CH3CH2OCH2CH3} \] Counting atoms: \[ C=4,\quad H=10,\quad O=1 \] So its molecular formula is: \[ \ce{C4H10O} \]
Step 4: Compare the structures.
Both compounds have the same molecular formula: \[ \ce{C4H10O} \] But the alkyl groups on the two sides of oxygen are arranged differently. Therefore, they are isomers.
Step 5: Final conclusion.
Hence, the correct pair of isomers is: \[ \ce{CH3OCH2CH2CH3} \] and: \[ \ce{CH3CH2OCH2CH3} \]
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