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JEE Main levelSingle correct optionDifficulty 2 of 3nm122

Which is the correct IUPAC name of the bicyclo[2.2.1]heptane that carries one methyl group on a bridgehead carbon and two methyl groups on the one-carbon bridge?

  1. A4,7,7-trimethylbicyclo[2.2.1]heptane
  2. B2,7,7-trimethylbicyclo[2.2.1]heptane
  3. C1,7,7-trimethylbicyclo[2.2.1]heptane
  4. D1,2,2-trimethylbicyclo[2.2.1]heptane

Answer: C

Number from a bridgehead along a longest bridge; the one-carbon bridge is always C-7. The bridgehead methyl can be C-1 or C-4 depending on the start, and the lowest locant set {1,7,7} beats {4,7,7}. The name is 1,7,7-trimethylbicyclo[2.2.1]heptane.
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