The compound(s) with $\mathrm{P}-\mathrm{H}$ bond(s) is(are)

• A

  $\mathrm{H}_3 \mathrm{PO}_4$
• Correct answer
  B

  $\mathrm{H}_3 \mathrm{PO}_3$
• C

  $\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_7$
• Correct answer
  D

  $\mathrm{H}_3 \mathrm{PO}_2$

Hence, the correct answer is options: 'B', 'D'.