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How many of the following reagents react with arene diazonium salts to form aryl halides? i . H B F 4 / Δ i i . K H S i i i . C u C N / K C N i v . C u B r / H B r v . C u / H C l v i . K I / Δ v i i . C H 3 C H 2 O H viii . H 3 PO 2 /H 2 O

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4

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