Question

The coordination number of $Co$ in $\left[Co\right(en{)}_{2}C{l}_2]Cl$ is:

• A. $3$
• B. $4$
• C. $5$
• D. $6$

Answer 1

Answer: (D)

$6$

Co-ordination number is defined as the number of co-ordinate bonds (in the co-ordination sphere) of the central metal atom ($Co$) with the ligands ($en$ and $Cl$).

In the given complex, $Co$ binds with two a bi-dentate ligand $en$ ($2\times 2=4$) and two mono-dentate ligand $Cl$ ($2\times 1=2$).

Therefore, its co-ordination number is $4+2=6$.

Hence, option D is correct.