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Question

In a real-life scenario, a chemist discovers a compound with the formula $CH_{3} CH_{2} CH(CH_{3})CH_{2} CH_{2} OH$. What is the correct IUPAC name for this compound?

This question was previously asked in
RRB JE 2025 CBT 2 Mechanical and Allied Engg Question Paper English (2-Jul-2026) (Shift-1)
The correct answer is

3-methylpentan-1-ol

Structural analysis of CH₃–CH₂–CH(CH₃)–CH₂–CH₂–OH:

  • Number of carbon atoms in the longest chain containing –OH: 5 carbons → pentane backbone
  • Functional group: –OH → an-1-ol (OH on C1)
  • Substituent: –CH₃ on C3 → 3-methyl

IUPAC name: 3-methylpentan-1-ol

Numbering: start from the end closest to the –OH group (right end) → C1 has OH, C3 has methyl branch.

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