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GK QUESTION#3256

A cyclohexane ring bears a methyl group and an unbranched propyl group on two ring carbons separated by one intervening ring carbon. Which name corresponds to this structure?

  1. A1-Methyl-2-propylcyclohexane
  2. B1-Methyl-1-propylcyclohexane
  3. C1-Methyl-3-propylcyclohexaneCorrect answer
  4. D1-Methyl-4-propylcyclohexane
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Answer

C. 1-Methyl-3-propylcyclohexane

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Explanation

The source structure is a cyclohexane ring with methyl and unbranched propyl substituents separated by one intervening ring carbon. The lowest locant set is 1,3. With the same set available in either direction, methyl receives 1 by alphabetical order, giving 1-methyl-3-propylcyclohexane.

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