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Q. Which one the following has largest number of isomers?
(R -= alkyl group, en = ethylenediamine)

AIEEEAIEEE 2004Coordination Compounds

Solution:

$\left[ Co ( en )_{2} C 1_{2}\right]^{+}$has largest number of isomers which includes geometrical isomers (cis and trans isomers) as well as stereoisomers (d form, l form and optically inactive form). en is a bidentate ligand.