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Identify ‘Y’ in the following reaction.

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in Chemistry – Class 12 by (188k points)
Identify ‘Y’ in the following reaction.

(a) PCl3

(b) H3PO4

(c) H3PO3

(d) H3PO2

The question was posed to me in unit test.

Query is from Diazonium Salts Chemical Reactions topic in section Amines of Chemistry – Class 12

1 Answer

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Right answer is (d) H3PO2

Explanation: In the reaction, benzenediazonium chloride is reduced to benzene. This is possible in the presence of a reducing agent. Since, one of the by products is H3PO3, it must be formed from the oxidation of the reducing agent, and hence must either have less O atoms or more H atoms than in H3PO3. Therefore, it is H3PO2.

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