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JEE Advanced levelSingle correct optionDifficulty 3 of 3nm145

A cyclohexane ring and a cyclopropane ring share one C-C bond. The cyclopropane carbon that is not shared carries a methyl group. The name is

  1. A7-methylbicyclo[4.1.0]heptane
  2. B2-methylbicyclo[4.1.0]heptane
  3. C7-methylbicyclo[1.4.0]heptane
  4. D1-methylbicyclo[4.1.0]heptane

Answer: A

The shared atoms are the bridgeheads (C-1 and C-6); the bridges contain 4, 1 and 0 carbons, cited in descending order [4.1.0]. Numbering runs C-1, C-2 to C-5 (4-carbon bridge), C-6, then C-7 (1-carbon bridge). The unshared cyclopropane carbon is C-7.
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