The decreasing order of the number of ionisable hydrogen atoms in the following molecules is:
$I$. $H_3PO_4$
$II$. $H_3PO_3$
$III$. $H_3PO_2$
$IV$. $H_4P_2O_6$

  • A
    $II > IV > I > III$
  • B
    $IV > III > II > I$
  • C
    $IV > I > II > III$
  • D
    $II > IV > III > I$

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