Concept:Compounds that share the same molecular formula but have completely different functional groups exhibit
functional group isomerism.
Solution:- Diethyl ether: \( \text{CH}_3\text{CH}_2\text{--O--CH}_2\text{CH}_3 \) (Functional group: Ether). Molecular formula: \( \text{C}_4\text{H}_{10}\text{O} \).
- n-butanol: \( \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{OH} \) (Functional group: Alcohol). Molecular formula: \( \text{C}_4\text{H}_{10}\text{O} \).
- Because they have identical formulas but different functional groups (ether vs. alcohol), they are functional isomers.
Why other options are incorrect:Chain isomers differ in skeleton, position isomers differ in location of the same functional group, and tautomers are dynamic equilibrium isomers.
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