The compound(s) with P-H bond(s) is(are)
- (A)
- (B)✓ Correct
- (C)
- (D)✓ Correct
Answer: (B), (D)
Solution
The structures of phosphorus oxyacids determine which have P-H bonds:
(A) H₃PO₄ (Phosphoric acid): All hydrogens are bonded to oxygen atoms (P-OH groups). No P-H bonds.
(B) H₃PO₃ (Phosphorous acid): Has one P-H bond and two P-OH groups. Structure shows one hydrogen directly bonded to phosphorus.
(C) H₄P₂O₇ (Pyrophosphoric acid): Formed by condensation of two H₃PO₄ molecules. All hydrogens are in P-OH groups. No P-H bonds.
(D) H₃PO₂ (Hypophosphorous acid): Has two P-H bonds and one P-OH group. Two hydrogens are directly bonded to phosphorus.
Therefore, only (B) and (D) contain P-H bonds.
A 
C 
D 
(A) H₃PO₄ (Phosphoric acid): All hydrogens are bonded to oxygen atoms (P-OH groups). No P-H bonds.
(B) H₃PO₃ (Phosphorous acid): Has one P-H bond and two P-OH groups. Structure shows one hydrogen directly bonded to phosphorus.
(C) H₄P₂O₇ (Pyrophosphoric acid): Formed by condensation of two H₃PO₄ molecules. All hydrogens are in P-OH groups. No P-H bonds.
(D) H₃PO₂ (Hypophosphorous acid): Has two P-H bonds and one P-OH group. Two hydrogens are directly bonded to phosphorus.
Therefore, only (B) and (D) contain P-H bonds.
JEE Advanced · 2025 · 18 May 2025 · Paper 2 · One or more correct options