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JEE Advanced levelSingle correct optionDifficulty 3 of 3nm024

A compound of formula has a degree of unsaturation of 6. What is the value of ?

  1. A12
  2. B9
  3. C10
  4. D11

Answer: D

DU = (2x + 2 + N - H - X)/2 = (2x + 2 + 1 - 12 - 1)/2 = (2x - 10)/2 = x - 5. Setting x - 5 = 6 gives x = 11. Check: C11H12ClN has (22 + 2 + 1 - 12 - 1)/2 = 6.
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