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AIIMS2017Chemistryp Block Elements (Group 15, 16, 17 & 18)

Which of the following oxoacids of phosphorus is a reducing agent and a monobasic acid as well?

Options

  1. AH ₄ P ₂ O ₅
  2. BHPO ₃
  3. CH ₃ PO ₃
  4. DH ₃ PO ₂

Correct answer

D. H ₃ PO ₂

Step-by-step solution

Acids which contain P - H bonds have strong reducing properties. Hypophosphorus acid ( H ₃ PO ₂ ) is a good reducing agent as it contains two P - H bonds. It has one P - OH bond, so it is monobasic.

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