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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm272

Which of the following statements about the compound shown are correct? Count constitutional isomers only and ignore stereoisomers.

  1. AIts degree of unsaturation is 1.
  2. BIt gives 5 different monochlorination products.
  3. CIt is a structural isomer of hex-1-ene.
  4. DIt is a chain isomer of hexane.

Answer: A, C

The compound is methylcyclopentane, C6H12: one ring gives degree of unsaturation 1, the same as hex-1-ene (C6H12), so they are ring-chain isomers. Hydrogen sets: CH3, C1-H, C2/C5, C3/C4, i.e. 4 monochloro products (not 5). Hexane is C6H14 and is not an isomer.
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