Concept:Functional group isomerism occurs when two molecules share a molecular formula but belong to entirely different chemical families (have different functional groups).
Solution:- The formula \( \text{C}_2\text{H}_6\text{O} \) corresponds to the general formula \( \text{C}_n\text{H}_{2n+2}\text{O} \), which characterizes saturated alcohols and ethers.
- It can be drawn as:
- Ethanol: \( \text{CH}_3\text{CH}_2\text{OH} \) (Alcohol)
- Dimethyl ether: \( \text{CH}_3\text{--O--CH}_3 \) (Ether)
- Since the functional group changes completely, this is functional group isomerism.
Why other options are incorrect:Position and chain isomerism require the functional group to remain the same. Metamerism requires a polyvalent functional group with at least 4 carbons to show different alkyl distributions.
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