Which of the following complex ion shows geometrical isomerism?

Which of the following complex ion shows geometrical isomerism?
  1. \(\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_4 \mathrm{Cl}_2\right]^{+}\)
  2. \(\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}\right]^{+}\)
  3. \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}\)
  4. \(\left[\mathrm{Co}(\mathrm{CN})_5(\mathrm{NC})\right]^{3-}\)

Solution

\(\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_4 \mathrm{Cl}_2\right]^{+}\)shows geometrical isomerism. It is complex compounds of \(\left[M a_4 b_2\right]\) type.
\(\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}\right]^{+},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}\) and \(\left[\mathrm{Co}(\mathrm{CN})_5(\mathrm{NC})\right]^{3-}\) do not show stereoisomerism.

Asked in: AP EAMCET 2020 (18 Sep Shift 1)

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