See image — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

# Solution **Analyzing the two compounds:** **Compound 1:** $CH_3-CH(Cl)-CH_2-C(=O)H$ - Contains an **aldehyde** functional group ($-CHO$) - Chlorine is a substituent on the carbon chain **Compound 2:** $CH_3-CH_2-CH_2-C(Cl)=O$ - Contains an **acyl chloride** functional group ($-COCl$) - This is the acid chloride derivative **Checking each option:** 1. **Position isomers** — Requires same functional group with different positions. ✗ (Different functional groups) 2. **Metamers** — Requires different alkyl groups on either side of the same functional group. ✗ (Different functional groups entirely) 3. **Optical isomers** — Requires chiral centers with different stereochemistry. ✗ (Not applicable here) 4. **Functional group isomers** — Compounds with **identical molecular formula but different functional groups**. ✓ Both have the formula $C_4H_7ClO$, but possess **different functional groups** (aldehyde vs. acyl chloride). **Answer: (4) Functional group isomers** — They are constitutional isomers differing in their functional groups while maintaining the same molecular formula.