1.

Which one of the following complexes will have four isomers? (en = ethylenediamine)

Answer»

`[CO(en)(NH_(3))_(2)Cl_(2)]Cl` <BR>`[Co(PPh_(3))_(2)(NH_(3))_(2)Cl_(2)]Cl`
`[Co(en)_(3)]Cl_(3)`
`[Co(en)_(2)Cl_(2)]Br`.

Solution :The four isomers of `[Co(en)_(2)Cl_(2)]` Br are trans-isomer, cis-isomer (d- and L- isomers) and ionization isomer [Co(en)BrCl]Cl.


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