NEET 2026 (Phase 1) · ChemistryPrevious Year Question
The correct IUPAC name of the following compound is:
Answer: (A) 3-ethyl-5-methylheptane. \textbf{Answer:} (a) \textbf{Solution:} The longest continuous chain has 7 carbons (heptane).
- A.3-ethyl-5-methylheptane✓
- B.2,4-diethylhexane
- C.5-ethyl-3-methylheptane
- D.3,5-diethylhexane
Correct Answer
(A) 3-ethyl-5-methylheptane
Solution & Explanation
\textbf{Answer:} (a) \textbf{Solution:} The longest continuous chain has 7 carbons (heptane). Numbering from the end that gives the lowest set of locants places an ethyl group on C-3 and a methyl group on C-5. Substituent prefixes are cited alphabetically (ethyl before methyl). The correct IUPAC name is 3-ethyl-5-methylheptane.
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