Question

The coordination number of Cu in \([Cu(CN)_4]^{3-}\) ion is:

• A. \( 1 \)
• B. \( 2 \)
• C. \( 3 \)
• D. \( 4 \)

Hint:

Coordination number depends on ligand type and geometry: - \( 4 \)-coordination: Square planar/tetrahedral - \( 6 \)-coordination: Octahedral

Answer 1

The Correct Option is D

Step 1: Understanding Coordination Number The coordination number is the number of ligand donor atoms bonded to the central metal ion. In \([Cu(CN)_4]^{3-}\), the cyanide ion (\(CN^-\)) acts as a monodentate ligand, coordinating to Cu through four bonds. Thus, the coordination number of Cu in this complex is: \[ 4 \]