Which of the following is an example of Sandmeyer's reaction?

C_{6} H_{5} N_{2}^{+} C l^{-} C u_{2} C l_{2} - --- \to C_{6} H_{5} C l

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C_{6} H_{5} N_{2}^{+} C l^{-} H_{2} O - - \to C_{6} H_{5} O H

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C_{6} H_{5} N_{2}^{+} C l^{-} K C N - -- \to C_{6} H_{5} C N

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None of the above

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Solution

The correct option is A $C_{6} H_{5} N_{2}^{+} C l^{-} C u_{2} C l_{2} - --- \to C_{6} H_{5} C l$
When freshly prepared diazonium salt of primary aromatic amine is treated with $C u_{2} X_{2}$ (X = Cl, Br), aryl halide is formed. This reaction is known as Sandmeyer’s reaction.

Hence, the correct answer is option (a).

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