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(D) $1$. $[Co(Py)_3(NH_3)_3]^{3+}$ is of the type $[M(A)_3(B)_3]$,which shows facial $(fac)$ and meridional $(mer)$ geometrical isomers. It does not s

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$[Cr(NO_2)_2(NH_3)_4]^{+}$

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(D) $1$. $[Co(Py)_3(NH_3)_3]^{3+}$ is of the type $[M(A)_3(B)_3]$,which shows facial $(fac)$ and meridional $(mer)$ geometrical isomers. It does not show optical isomerism. Total isomers = $2$.$2$. $[Ni(en)(NH_3)_4]^{2+}$ is of the type $[M(AA)(B)_4]$,which shows only geometrical isomerism (cis-trans). Total isomers = $2$.$3$. $[Fe(C_2O_4)(en)_2]^{2-}$ is of the type $[M(AA)_3]$,which shows optical isomerism (d and l forms). Total isomers = $2$.$4$. $[Cr(NO_2)_2(NH_3)_4]^{+}$ is of the type $[M(A)_4(B)_2]$,which shows geometrical isomerism (cis and trans). The cis-isomer is optically active (exists as d and l forms),while the trans-isomer is optically inactive. Total isomers = $3$ (cis-d,cis-l,and trans).Therefore,$[Cr(NO_2)_2(NH_3)_4]^{+}$ exhibits the highest number of isomers.

Which of the following complexes exhibits the highest number of isomers?

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