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Consider the following reaction: A + alkali → B (Major Product) If B is an oxoacid of phosphorus with no P-H bond, then A is:

1. White P4
2. Red P4
3. P2O3
4. H3PO3

Correct answer: Red P4

Solution

Red P4 is the correct answer because it can react with an alkali to form an oxoacid of phosphorus, specifically phosphoric acid, which does not contain any P-H bonds. In contrast, the other options either do not lead to the formation of an oxoacid or contain P-H bonds.

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