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JEE Main levelSingle correct optionDifficulty 2 of 3g1125

The correct order of the hyperconjugation ability (Baker-Nathan order) of alkyl groups attached to a pi system is

  1. A
  2. B
  3. C
  4. D

Answer: C

The number of alpha hydrogens falls from 3 in methyl, 2 in ethyl, 1 in isopropyl to 0 in tert-butyl. Hyperconjugation therefore decreases in the order methyl > ethyl > isopropyl > tert-butyl.
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