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What product is formed when benzenediazonium chloride (C6H5N2+Cl−) is treated with CuCl?

1. C6H5Cl
2. C6H6
3. C6H5−C6H5
4. C6H4Cl2

Correct answer: C6H5Cl

Solution

When benzenediazonium chloride reacts with copper(I) chloride (CuCl), it undergoes a substitution reaction that replaces the diazonium group with a chlorine atom, resulting in the formation of chlorobenzene (C6H5Cl). This reaction is a classic method for synthesizing aryl halides from diazonium salts.

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