The pair that contains two P–H bonds in each of the oxoacids is:

Question

Canvas Classes · Accepted Answer

P–H bonds in phosphorus oxoacids:

| Acid | Formula | P–H bonds per molecule |
|---|---|---|
| Hypophosphorous acid |  | 2 ✓ |
| Phosphorous acid |  | 1 |
| Pyrophosphorous acid |  | 2 (1 per P atom × 2 P) ✓ |
| Hypophosphoric acid |  | 0 |

Both  and  have 2 P–H bonds each.

Answer: Option (4) —  and

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