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← ScienceWhich consequence results when a sterically hindered platinum complex experiences ligand substitution?
A)Increased rate of oxidative addition
B)Preferential associative substitution
C)Enhanced dissociative substitution✓
D)Increased orbital overlap with reactants
💡 Explanation
Enhanced dissociative substitution occurs because steric hindrance destabilizes transition states with increased coordination number; the steric bulk encourages ligand dissociation via a dissociative mechanism, rather than associative pathways, therefore leading to faster substitution when ligands leave.
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