Which among the following is true for the Balz-Schiemann reaction?

  • A
    In this,$Ar-Cl$ is obtained from $Ar-N_{2}^{+} X^{-}$
  • B
    It is useful for the preparation of nitrobenzene from benzene diazonium salts
  • C
    In this,$Ar-CN$ is obtained from $Ar-N_{2}^{+} X^{-}$
  • D
    In this,$Ar-F$ is obtained from $Ar-N_{2}^{+} X^{-}$

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Which of the following are intermediates in the Sandmeyer reaction?
$(i)$ $C_6H_5N^{+} \equiv NCl^{-}$
$(ii)$ $C_6H_5N^{+} \equiv N$
$(iii)$ $\overset{\centerdot }{C}_6H_5$
$(iv)$ $C_6H_5Cl$

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