Which of the following name formula combinations is not correct?

Which of the following name formula combinations is not correct?
  1. $\mathrm{K}_2\left[\mathrm{Pt}(\mathrm{CN})_4\right]$ - Potassium tetracyanoplatinate (II)
  2. $\left[\mathrm{Mn}(\mathrm{CN})_5\right]^{2-}$ - Pentacyanomagnate (II) ion
  3. $\mathrm{K}\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_4\right]$ - Potassium diammine tetrachlorochromate (III)
  4. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\left(\mathrm{H}_2 \mathrm{O}\right) \mathrm{I}\right] \mathrm{SO}_4$ - Magnetron value.

Solution

The correct IUPAC Name of $\left[\mathrm{Mn}(\mathrm{CN})_5\right]^{2-}$. Pentacyanomangnate (III).

Asked in: JEE Main 2014 (11 Apr Online)

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