JEE Main Chemistry question

Which of the following reactions is an example of the Sandmeyer reaction?

(A)ArN_2^{+}HSO_4^{-} \xrightarrow{CuBr} Ar-BrCorrect
(B)ArN_2^{+}HSO_4^{-} \xrightarrow[HBr]{Cu powder} Ar-Br (Gattermann-type, copper powder instead of a cuprous salt)
(C) (uncatalysed halide exchange)
(D)ArN_2^{+}HSO_4^{-} \xrightarrow{NaNO_2/Cu} Ar-NO_2

Answer: (A)

Solution

The Sandmeyer reaction, strictly defined, is the conversion of a diazonium salt to an aryl halide (or pseudohalide) using a cuprous (Cu(I)) salt such as cuprous bromide/chloride/cyanide as the catalyst — this matches option (a) directly. Using copper powder with the corresponding acid (option b) is the

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Question ID VK-150354