Which one of the following bas largest number of isomers ?

Options

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

Answer

D

Explanation

Isomers
`underset("cis and trans")([Ru(NH_(3))_(4)Cl_(2)]^(+)),underset("none")([Co(NH_(3))_(5)Cl]^(2+))`, `underset("cis and trans")([Ir(PR_(3))_(2)H(CO)]^(2+)),underset("cis and trans and optical isomers")([Co(en)_(2)Cl_(2)]^(+))`.