Question

Which one of the following complexes is an outer orbital complex?

• A. [Co(NH₃)₆]³+
• B. [Mn(CN)₆]⁴-
• C. [Fe(CN)₆]⁴-
• D. [Ni(NH₃)₆]²+

Hint:

Outer orbital complexes involve sp³d² hybridisation using outer d-orbitals.

Answer 1

The Correct Option is D

Step 1: Outer orbital complexes use sp³d² hybridisation. Step 2: \beginitemize • Strong field ligands (CN⁻) form inner orbital complexes. • Weak field ligands (NH₃) may form outer orbital complexes. \enditemize Step 3: Nickel(II) with ammonia forms an outer orbital complex.