Phosphorous reacts with chlorine gas to give a colourless liquid, which fumes in moist air to produce $\mathrm{HCl}$ and

• A

  $\mathrm{POCl}_{3}$
• Correct answer
  B

  $\mathrm{H}_{3} \mathrm{PO}_{3}$
• C

  $\mathrm{PH}_{3}$
• D

  $\mathrm{H}_{3} \mathrm{PO}_{4}$

Hence, the correct answer is option: 'B'.