See image — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

# Dimethyl Ether and Ethyl Alcohol Classification **Structures:** - Dimethyl ether: $CH_3-O-CH_3$ (molecular formula: $C_2H_6O$) - Ethyl alcohol: $CH_3-CH_2-OH$ (molecular formula: $C_2H_6O$) **Analysis:** 1. **Same molecular formula:** Both have $C_2H_6O$ ✓ 2. **Different functional groups:** - Dimethyl ether contains an **ether** group ($-O-$) - Ethyl alcohol contains an **alcohol** group ($-OH$) 3. **Definition check:** - **Metamers** differ in alkyl chain arrangement (same functional group) - **Homologues** differ by $CH_2$ units (same functional group) - **Functional isomers** have the same molecular formula but **different functional groups** ✓ - **Position isomers** differ only in position of a substituent/group on the same chain **Conclusion:** Since both compounds have identical molecular formulas but different functional groups (ether vs. alcohol), they are **functional isomers**. **Answer: (3) Functional isomers**