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Which of the following complex ions

Question:

Which of the following complex ions will exhibit optical isomerism?

$(\mathrm{en}=1,2$-diamine ethane)

1. $\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+}$

2. $\left[\mathrm{Zn}(\mathrm{en})_{2}\right]^{2+}$

3. $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]^{+}$

4. $\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]^{+}$

Correct Option: 1

Solution:

Solution not required