Q36 / 180 · JIPMER 2016 · Chemistry

$\left[\mathrm{CuCl}_4\right]^{2-}$ exists while $\left[\mathrm{Cul}_4\right]^{2-}$ does not exist, because

  • Correct answer
    A
    $\mathrm{I}^{-}$is stronger reductant than $\mathrm{Cl}^{-}$
  • B
    $\mathrm{I}^{-}$is weaker reductant than $\mathrm{Cl}^{-}$
  • C
    $\mathrm{I}^{-}$is stronger oxidant than $\mathrm{Cl}^{-}$
  • D
    None of the above

Solution

AsI- is stronger reducing agent, i.e., reductant than $\mathrm{Cl}^{-}$ and reduces $\mathrm{Cu}^{2+}$ into Cul and itself is oxidised into $\mathrm{I}_2$. $\mathrm{Cl}^{-}$is not that much strong reducing agent and does not reduce $\mathrm{Cu}^{2+}$. Therefore, $\left[\mathrm{CuCl}_4\right]^{2-}$ exists but $\left[\mathrm{CuCl}_4\right]^{2-}$ does not.

Hence, the correct answer is option: 'A'.

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