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

  1. A1-ethyl-5-methylcyclohexane
  2. B3-ethyl-1-methylcyclohexane
  3. C1-methyl-4-ethylcyclohexane
  4. D1-ethyl-3-methylcyclohexane

Answer: D

The compound is 1-ethyl-3-methylcyclohexane. The locant set is {1,3} either way round the ring, so the tie is broken alphabetically: ethyl is cited first and takes locant 1. Naming it 1-ethyl-5-methyl uses a higher set, and 3-ethyl-1-methyl ignores the alphabetical rule.
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