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Identify ‘Y’ in the following reaction.(a) PCl3(b) H3PO4(c) H3PO3(d) H3PO2The question was posed to me in unit test.Query is from Diazonium Salts Chemical Reactions topic in section Amines of Chemistry – Class 12

Answer»

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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