The $+I$ effect of alkyl groups follows the order:

  • A
    $3^\circ > 2^\circ > 1^\circ > -CH_3$
  • B
    $1^\circ > 2^\circ > 3^\circ > -CH_3$
  • C
    $-CH_3 > 1^\circ > 2^\circ > 3^\circ$
  • D
    None of these

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