Which of the following is a Sandmeyer reaction?

2 C_{6} H_{5} C l {C u}_{2} {C l}_{2} / H C l - ------- \to C_{6} H_{6} + {C l}_{2}

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C_{6} H_{5} N_{2} C l {C u}_{2} {C l}_{2} / H C l - ------- \to C_{6} H_{5} C l + N_{2}

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C_{6} H_{5} O H Z n d u s t - ---- \to C_{6} H_{6} + Z n O

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C_{6} H_{5} {N O}_{2} + 6 [H] S n / H C l - ---- \to C_{6} H_{5} {N H}_{2} + 2 H_{2} O

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Solution

The correct option is B $C_{6} H_{5} N_{2} C l {C u}_{2} {C l}_{2} / H C l - ------- \to C_{6} H_{5} C l + N_{2}$
In Sandmeyer's reaction, an arenediazonium salt reacts with cuprous chloride in hydrochloric acid to form chlorobenzene.
So, option $B$ is the correct answer.

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