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JEE Main levelSingle correct optionDifficulty 2 of 3g1265

Count the number of hydrogens on sp3 carbons directly attached to the positively charged carbon of the ion shown (the number of hyperconjugative structures).

  1. A3
  2. B6
  3. C9
  4. D12

Answer: C

The ion shown is the tert-butyl cation. The charged carbon carries three methyl groups with 3 hydrogens each. So there are 3 x 3 = 9 alpha hydrogens.
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