Number of possible isomers for the complex [Co(en)2Cl2] Cl will be (en = ethylenediamine) (AIPMT 2015)

Number of possible isomers for the complex [Co(en)2Cl2]Cl will be (where en = ethylenediamine) 3. It has two geometrical isomers cis and trans. The trans isomer is optically inactive whereas the cis isomer exists in d and l forms. Therefore, total 3 isomers are possible of the complex. Hence, the correct option is (a).