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← ScienceWhat mechanism causes increased reactivity when an alkene coordinates to a platinum catalyst?
A)Pi-backbonding increases electron density✓
B)Steric clashes induce ring strain
C)Sigma donation weakens platinum bonds
D)Frontier orbital overlap decreases selectivity
💡 Explanation
Increased reactivity occurs because pi-backbonding weakens the alkene’s pi-bond, making it more electrophilic. This is due to electron density donation to pi* antibonding orbitals in the alkene, therefore facilitating reactions with nucleophiles, rather than steric or frontier orbital mechanisms.
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