Organic Chemistry — Easy JEE chemistry MCQ
The IUPAC name of the compound $\text{CH}_3\text{-CH}(\text{OH})\text{-CH}_2\text{-CH}(\text{CH}_3)\text{-CHO}$ is:
- A. 4-hydroxy-2-methylpentanal
- B. 2-hydroxy-4-methylpentanal
- C. 4-methyl-2-hydroxypentanal
- D. 2-methyl-4-hydroxypentanal
Solution
First, identify the principal functional group. The aldehyde (-CHO) has highest priority, so the chain is numbered starting from the aldehyde carbon.
Numbering from CHO:
- C1: CHO
- C2: CH(CH₃)
- C3: CH₂
- C4: CH(OH)
- C5: CH₃
Substituents:
- Methyl group at C2
- Hydroxyl group at C4
IUPAC name: **4-hydroxy-2-methylpentanal**
