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Question:

Which of the following compounds has a P-P bond?

(HPO3)3

H4P2O7

H4P2O5

H4P2O6

Solution:

Hypophosphoric acid H₄P₂O₆ contains a P-P bond. The oxidation state of P is +4. It contains four P-OH bonds, two P=O bonds and one P-P bond. Hence, option H₄P₂O₆ is correct.