Which one of the following information about the compounds is correct ? CompoundsOxidation state of PNo. of P–OH bondsNo. of P–H bondsNo. of P=O bonds[I] H3PO2 Hypophosphorous acid1+210[II] H4P2O5 pyropophosphorous acid3+222[III] H4P2O6 Hypophosphoric acid4+222[IV] H4P2O7 pyrophosphoric acid5+314

Which one of the following information about the compounds …

Chemistry Chemical Bonding and Molecular Structure General Single Correct MCQ

Published on: August 14, 2026

Which one of the following information about the compounds is correct ?

Compounds	Oxidation state of P	No. of P–OH bonds	No. of P–H bonds	No. of P=O bonds
[I] H3PO2 Hypophosphorous acid	1+	2	1	0
[II] H4P2O5 pyropophosphorous acid	3+	2	2	2
[III] H4P2O6 Hypophosphoric acid	4+	2	2	2
[IV] H4P2O7 pyrophosphoric acid	5+	3	1	4

III

Verified by Experts

The correct answer is:

(I) H 3 PO 2 →

Oxidation state of P = +1

No. of P-OH bond = 1

No. of P–H bond = 2

No. of P=O bond = 0

⇒ option is incorrect.

(II) H 4 P 2 O 5 →

Oxidation state of P = +3

No. of P-OH bond = 2

No. of P–H bond = 2

No. of P=O bond = 2 ⇒ correct option is II.

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