Solve this following


The isomer(s) of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]$ that has/have a $\mathrm{Cl}-\mathrm{Co}-\mathrm{Cl}$ angle of $90^{\circ}$, is/are :

  1. meridional and trans

  2. cis and trans

  3. trans only

  4. cis only

Correct Option: , 4


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