Question
  1. Explain the following giving suitable examples:
  1. Sandmeyer’s reaction.
  2. Coupling reaction of a diazonium salt.
  1. Explain the observed $K_b$ order:
$Et_2NH>Et_3N>EtNH_2$ in aqueous solution.

Answer

  1.  
  1. Sandmeyer’s Reaction:
$\text{C}_{6}\text{H}_{5}\text{N}_{2}^{+}\text{Cl}^{-}\xrightarrow{CuCl/HCl}\text{C}_{6}\text{H}_{5}\text{Cl}+\text{N}_{2}.$
  1. Coupling reaction:
  1. Due to combined effect of steric hinderance, hydration & inductive effects.

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