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(D) $1$. $[Co(NH_3)_4Cl_2]^+$ is an $MA_4B_2$ type complex,which shows $2$ geometrical isomers (cis and trans). The cis-isomer is optically active,giv

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$[Cr(SCN)_2(NH_3)_4]^+$

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(D) $1$. $[Co(NH_3)_4Cl_2]^+$ is an $MA_4B_2$ type complex,which shows $2$ geometrical isomers (cis and trans). The cis-isomer is optically active,giving $2$ enantiomers,so total isomers = $3$.$2$. $[Ni(en)(NH_3)_4]^{2+}$ is an $M(AA)B_4$ type complex,which shows no geometrical or optical isomerism.$3$. $[Ni(C_2O_4)(en)_2]$ is an $M(AA)_3$ type complex,which shows optical isomerism ($2$ enantiomers).$4$. $[Cr(SCN)_2(NH_3)_4]^+$ is an $MA_4B_2$ type complex (with linkage isomerism due to $SCN^-$),which shows $2$ geometrical isomers. The cis-isomer is optically active ($2$ enantiomers). Additionally,$SCN^-$ can show linkage isomerism ($SCN^-$ and $NCS^-$). Thus,it exhibits the maximum number of isomers.

Which of the following will give the maximum number of isomers?

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