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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm165

Select the species with degree of unsaturation equal to 4.

  1. Aspiro[4.4]nona-1,6-diene,
  2. Btoluene,
  3. Cbenzaldehyde,
  4. D1-chloronaphthalene,

Answer: A, B

DU = (2C + 2 - H - X)/2: toluene (14 + 2 - 8)/2 = 4; the spirodiene (18 + 2 - 12)/2 = 4 (two rings plus two C=C); benzaldehyde (14 + 2 - 6)/2 = 5; 1-chloronaphthalene (20 + 2 - 7 - 1)/2 = 7.
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