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JEE Main levelSingle correct optionDifficulty 2 of 3nm012

What is the degree of unsaturation of 4-ethenylcyclohexene?

  1. A3
  2. B5
  3. C2
  4. D4

Answer: A

The structure is C8H12. It has 1 ring, 1 ring C=C and 1 C=C in the ethenyl group, so rings + pi bonds = 3. Check: (2x8 + 2 - 12)/2 = 3.
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