Would you expect the complex [co(en)3]cl3 to have any unpaired electrons? any isomers?

zero unpaired electrons

And exist as geometrical and optical isomers

Explanation:

Since here oxidation no of Central atom Co is +3 and Electronic configuration=[Ar]3d6

And en is a strong field ligand hence pairing of Electrons involved and it results zero unpaired electrons.

Cis isomer exists as active d and l isomers while trans isomer is optically inactive .