On the basis of stability of complex ion in the solution, complexes may be of two types, perfect and imperfect complexes. The stability depends upon the extent of dissociation which in turn depends up

Question

On the basis of stability of complex ion in the solution, complexes may be of 
two types, perfect and imperfect complexes. The stability depends upon the 
extent of dissociation which in turn depends upon the strength of metal-ligand 
bond. The stability of complex also depends upon charge on central metal atom, 
basic nature of ligand, chelation, and nature of metal ion and ligand according 
to HSAB principle.

Prashant Kotian · Accepted Answer

Correct answer: B. Step 1: Identify that CN^-, CO, and NO^+ are 14-electron isoelectronic species (CN^- = 6+7+1 = 14; CO = 6+8 = 14; NO^+ = 7+8-1 = 14). Step 2: According to molecular orbital (MO) theory, any 14-electron diatomic species has a bond order of 3.0 with all electrons paired in the molecular orbitals. Step 3: Consequently, all three species are diamagnetic and possess a bond order of three, matching option (a).

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