question_answer

Which one of the following is wrongly matched?

A) \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\]       - Square planar

B) \[[Ni{{(CO)}_{4}}]\]                         - Neutral ligand

C) \[[Fe{{(C{{N}_{6}})}^{3-}}]\]                       - \[s{{p}^{3}}{{d}^{2}}\]

D) \[{{[Co{{(en)}_{3}}]}^{3+}}\]      - Follows EAN rule

Correct Answer: C

Solution :

(a) In \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}},Cu\] is present as \[C{{u}^{2+}}\]                 \[C{{u}^{2+}}=[Ar]\,\,3{{d}^{9}}4{{s}^{0}}\]