Ligands are broadly classified into two classes classical and non-classical ligands, depending on their donor and acceptor ability. Classical ligands form classical complexes while non-classical ligan

Question

Ligands are broadly classified into two classes classical and non-classical 
ligands, depending on their donor and acceptor ability. Classical ligands form 
classical complexes while non-classical ligands form non-classical complexes. 
Bonding mechanism in non-classical is called synergic bonding.

Prashant Kotian · Accepted Answer

Correct answer: D. Step 1: Ammonia (NH3) is a Lewis base that coordinates to copper ions through the lone pair of electrons on its nitrogen atom. Step 2: In acidic solutions, the high concentration of protons (H^+) causes ammonia to undergo protonation to form the ammonium ion (NH4^+). Step 3: Because NH4^+ lacks a lone pair of electrons, it cannot coordinate to Cu^2+ ions. Therefore, ammonia coordinates with protons instead of forming the complex, which corresponds to option (d).

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