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JEE Main levelSingle correct optionDifficulty 2 of 3nm254

What is the name of the compound shown? Use von Baeyer rules: bridges in decreasing order in the brackets, numbering from a bridgehead.

  1. A7,7-dimethylbicyclo[2.2.1]heptane
  2. B2,2-dimethylbicyclo[2.2.1]heptane
  3. C1,7-dimethylbicyclo[2.2.1]heptane
  4. D8,8-dimethylbicyclo[3.2.1]octane

Answer: A

The compound is 7,7-dimethylbicyclo[2.2.1]heptane. The one-carbon bridge is numbered last, so it is C7; both methyls are on that carbon. The ring system has 7 carbons with bridges 2, 2, 1.
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