question_answer

\[{{[Fe\,{{(en)}_{2}}{{({{H}_{2}}O)}_{2}}]}^{2+}}+en\to \] complex (X). The correct statement about the complex (X) is -

A) it is a low spin complex

B) it is diamagnetic

C) it shows geometrical isomerism

D) [a] and [b] both

Correct Answer: D

Solution :

[d] Complex X is\[{{[Fe{{(en)}_{3}}]}^{2+}}\]; as 'en' is a strong field ligand pairing of electrons will take place. Hence, hybridisation is \[{{d}^{2}}s{{p}^{3}}\] and complex is diamagnetic. As it has 3 bidentate symmetrical 'en' ligands so it will not show geometrical isomerism.