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(A) The given reaction is the Balz-Schiemann reaction. In this reaction,benzenediazonium tetrafluoroborate $(C_6H_5N_2^+BF_4^-)$ is heated,which leads

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Fluorobenzene

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(A) The given reaction is the Balz-Schiemann reaction. In this reaction,benzenediazonium tetrafluoroborate $(C_6H_5N_2^+BF_4^-)$ is heated,which leads to the decomposition of the diazonium salt to form fluorobenzene,nitrogen gas $(N_2)$,and boron trifluoride $(BF_3)$. The reaction is: $C_6H_5N_2^+BF_4^- \xrightarrow{\Delta} C_6H_5F + N_2 + BF_3$. Therefore,the product $A$ is fluorobenzene.

In this process,the product $A$ is:

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