Question

The number of d-d transition(s) expected for the complex [Cu(NH3)2(H2O)]²⁺ is

• A. 1
• B. 2
• C. 3
• D. 4

Hint:

For a d⁹ configuration in a metal complex, only one d-d transition is possible due to the presence of one unpaired electron.

Answer 1

The Correct Option is C

Step 1: Understanding the d-d transitions.
The d-d transitions occur when an electron moves between different d-orbitals of the central metal ion. The number of possible d-d transitions depends on the electronic configuration and the geometry of the complex. For the given complex [Cu(NH3)2(H2O)]²⁺, Cu²⁺ has a d⁹ configuration, which corresponds to 1 unpaired electron in the d-orbital.

Step 2: Analyzing the options.
(A) Correct: With a d⁹ configuration, only 1 d-d transition is expected.
(B), (C), (D): Incorrect, as these do not match the expected number of transitions for this complex.

Step 3: Conclusion.
The correct answer is (A).