Total number of geometric isomers possible for an octahedral molecules, two `CI^(-)` ions and one `NO_(2)^(-)` ion is

Options

A. 3
B. 6
C. 9
D. 4

Answer

B

Explanation

Three structure isomers are possible `[CoC1_(2)(en)]` `NO_(2),[CoC1(en)_(2)NO_(2)]C1, [CoC1(en)_(2)ONO]` . Two geometric isomers are possible for each of these. Consider the first complex in which two of the C1 ligands can be either cis (`90^(@)` separation) or trans (`180^(@)` separation). Same is true for C1 and `NO_(2)` in the second cemplex and C1 and ONO in the third complex.