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  4. The number of possible isomers of an octahedral complex [ CoCl 2( en )( NH 3)2]+ is

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Q. The number of possible isomers of an octahedral complex $\left[ CoCl _{2}( en )\left( NH _{3}\right)_{2}\right]^{+}$ is

UP CPMTUP CPMT 2015Coordination Compounds

Solution:

$\left[ CoCl _{2}( en )\left( NH _{3}\right)_{2}\right]^{+}$ has $\left[M(A A)\left(B_{2}\right)\left(C_{2}\right)\right]$ type configuration. Thus, it shows four isomers.

(i) Two optical isomers are:

image

(ii) Two geometrical isomers are :

image