What is the organic product formed when benzenediazonium chloride (C6H5N2+Cl-) is warmed with hypophosphorous acid (H3PO2) in aqueous solution?
Answer and explanation
Correct answer: C. Benzene (C6H6)
.
- Step 1: Benzenediazonium chloride undergoes reduction when treated with mild reducing agents such as hypophosphorous acid (, also called phosphinic acid) or ethanol ().
- Step 2: The diazonium group () is replaced by hydrogen, while is oxidized to phosphorous acid ():
- Step 3: This reaction provides an essential synthetic route for deamination of aromatic rings.
Answer
Benzene (C6H6)
Why not the others: 'Phenol' is formed by heating the diazonium salt with water or dilute acid (); 'Chlorobenzene' is formed by the Sandmeyer reaction with ; 'Nitrobenzene' is formed by treating with in the presence of copper.
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