Which of the following will give maximum number of isomers?

Which of the following will give maximum number of isomers?
  1. $\left[\mathrm{Co}\left(\mathrm{NH}_{3}ight)_{4} \mathrm{Cl}_{2}ight]$
  2. $\left[\mathrm{Ni}(\mathrm{en})\left(\mathrm{NH}_{3}ight)_{4}ight]^{2+}$
  3. $\left[\mathrm{Ni}\left(\mathrm{C}_{2} \mathrm{O}_{4}ight)(\mathrm{en})_{2}ight]$
  4. $\left[\mathrm{Cr}(\mathrm{SCN})_{2}\left(\mathrm{NH}_{3}ight)_{4}ight]^{2+}$

Solution

The complex ion $\left[\mathrm{Cr}(\mathrm{SCN})_{2}\left(\mathrm{NH}_{3}ight)_{4}ight]^{2+}$ can
exhibit geometrical and linkage isomerism .

Asked in: JEE-TOPICTESTS-CHEMISTRY

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