Question

The shape of \([ \text{Cu}(\text{NH}_3)_4 ]^{2+}\) is:

• A. Tetrahedral
• B. Square planar
• C. Pyramidal
• D. Octahedral

Hint:

In \( {d}^9 \) complexes, such as \( [{Cu(NH}_3)_4]^{2+} \), the geometry is typically square planar due to the arrangement of ligands around the metal ion.

Answer 1

The Correct Option is B

Step 1: The complex ion \( [{Cu(NH}_3)_4]^{2+} \) consists of a central copper ion surrounded by four ammonia ligands. The copper ion in this case is in the \( {d}^9 \) configuration.
Step 2: For a \( {d}^9 \) metal ion, the geometry of the complex is typically square planar due to the electronic configuration and ligand field.
Step 3: Therefore, the shape of \( [{Cu(NH}_3)_4]^{2+} \) is square planar.