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JEE Main levelSingle correct optionDifficulty 2 of 3nm224

What is the IUPAC name of the compound shown? Use the NCERT-style rules: lowest locants, prefixes in alphabetical order.

  1. A3,4-dimethylhexane
  2. B3-isopropylpentane
  3. C2-methyl-3-ethylpentane
  4. D3-ethyl-2-methylpentane

Answer: D

The compound is 3-ethyl-2-methylpentane. The longest chain is pentane (5 C), with ethyl at C3 and methyl at C2. Prefixes are arranged alphabetically (ethyl before methyl). Choosing the isopropyl-bearing 3-carbon branch as a substituent on pentane (3-isopropylpentane) fails the rule of selecting the chain with the most substituents.
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