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(A) The complex $[Co(en)_2Cl_2]^+$ exhibits the largest number of isomers among the given options.It shows geometrical isomerism ($cis$ and $trans$ fo

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$[Co(en)_2Cl_2]^+$

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(A) The complex $[Co(en)_2Cl_2]^+$ exhibits the largest number of isomers among the given options.It shows geometrical isomerism ($cis$ and $trans$ forms).The $cis$ form is optically active and exists as a pair of enantiomers ($d$ and $l$ forms),while the $trans$ form is optically inactive.Thus,it has a total of $3$ isomers ($cis-d$,$cis-l$,and $trans$).$en$ (ethylenediamine) is a bidentate ligand,which allows for these stereochemical variations.

Which of the following has the largest number of isomers?

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