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JEE Main levelSingle correct optionDifficulty 2 of 3nm032

What is the IUPAC name of ?

  1. A3-(1-methylethyl)hexane
  2. B3-ethyl-2-methylhexane
  3. C4-ethyl-5-methylhexane
  4. D2-methyl-3-ethylhexane

Answer: B

Several six-carbon chains are possible. The chain that carries the most substituents is chosen, so the parent is hexane with a methyl and an ethyl group. Numbering from the end near the methyl gives locants {2,3}, lower than {4,5}. Prefixes are cited alphabetically (ethyl before methyl). The name is 3-ethyl-2-methylhexane.
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