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Which of these represents the accurate molecular structure of hypophosphorous acid?

1. H4P2O7: O=P−O−P=O with two −OH groups attached
2. H3PO2: An −OH group and one −H bonded to phosphorus, along with a double-bonded oxygen
3. H3PO3: Two −OH groups and one −H bonded to phosphorus, along with a double-bonded oxygen
4. H3PO4: Three −OH groups bonded to phosphorus, along with a double-bonded oxygen

Correct answer: H3PO2: An −OH group and one −H bonded to phosphorus, along with a double-bonded oxygen

Solution

Hypophosphorous acid has the molecular formula H3PO2 and its structure consists of one hydroxyl group (-OH) and two hydrogen atoms directly bonded to phosphorus, along with a double-bonded oxygen atom.

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