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JEE Advanced levelSingle correct optionDifficulty 3 of 3nm158

The total number of structural isomers of that are alkenes or cycloalkanes (constitutional isomers only) is

  1. A10
  2. B12
  3. C9
  4. D8

Answer: A

Open-chain alkenes: pent-1-ene, pent-2-ene, 2-methylbut-1-ene, 3-methylbut-1-ene, 2-methylbut-2-ene = 5. Cycloalkanes: cyclopentane, methylcyclobutane, 1,1-dimethylcyclopropane, 1,2-dimethylcyclopropane, ethylcyclopropane = 5. Total 10 (12 is reached only by also counting the E/Z pair of pent-2-ene and the cis/trans pair of 1,2-dimethylcyclopropane).
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