Which one of the following has largest number of isomers?

Options

A. `[Ru(NH_(3))_(4)Cl_(2)]^(+)`
B. `[Co(NH_(3))_(5)Cl]^(2+)`
C. `[Ir(PR_(3)P)_(2)H(CO)]^(2+)`
D. `[Co(en)_(2)Cl_(2)]^(+)`

Answer

4

Explanation

The complex `[Co(en)_(2)Cl_(2)]^(+)` shows geometrical as well as optical isomerism