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JEE Main levelSingle correct optionDifficulty 2 of 3nm256

Which name correctly describes the skeleton of the compound shown, a ring system with two shared adjacent carbon atoms?

  1. Abicyclo[5.3.0]decane
  2. Bbicyclo[4.3.1]decane
  3. Cbicyclo[4.4.0]decane
  4. Dspiro[4.5]decane

Answer: C

The compound is bicyclo[4.4.0]decane (decalin, decahydronaphthalene). The two six-membered rings share a bond, so the bridgeheads are adjacent and the zero-carbon bridge is written as 0: bridges of 4, 4 and 0 carbons make 10 in total.
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