Which is the strongest acid? ($pK_a$ value is given in the bracket)

  • A
    $HCOOH \ (3.77)$
  • B
    $C_6H_5COOH \ (4.22)$
  • C
    $CH_3COOH \ (4.71)$
  • D
    $CH_3CH_2COOH \ (4.88)$

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