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Explain the following name reactions : ...

Explain the following name reactions :
Sandmeyer reaction

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Sandmeyer reaction : Formation of chloro benzene, Brono benzene (or) cyano benzene from benzene diazonium salts with reagents `Cu_(2)Cl_(2)//HCl, Cu_(2)Br_(2)//HBr, CuCN//KCN` is called sandmayers reaction.
`C_(6)H_(5)N_(2).^(+)X^(-) overset(Cu_(2)Cl_(2)//HCl) to C_(6)H_(5)Cl+N_(2)`
`C_(6)H_(5)N_(2).^(+)X^(-) overset(Cu_(2)Br_(2)//HBr) to C_(6)H_(5)Br+N_(2)`
`C_(6)H_(5)N_(2).^(+)X^(-) overset(CuCN//KCN) to C_(6)H_(5)CN+N_(2)`
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Knowledge Check

  • Which of the following intermediates in Sandmeyer's reaction ?

    A
    `C_(6)H_(5)-overset(o+)N-=N`
    B
    `overset(cdot)(C_(6))H_(5)` (Phenyl radical)
    C
    `C_(6)H_(5)Cl`
    D
    `C_(6)H_(5)overset(+)(N)-=NCl^(-)`

  • Which of the following is not be prepared by Sandmeyer's reaction ?

    A
    Chlorobenzene
    B
    Bromobenzene
    C
    Iodobenzene
    D
    Fluorobenzene