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How is the M-C pi bond formed?(a) Donation of electron pair of half-filled metal d orbital to empty bonding pi orbital of CO(b) Donation of electron pair of filled metal d orbital to empty bonding pi orbital of CO(c) Donation of electron pair of filled metal d orbital to empty antibonding pi orbital of CO(d) Donation of electron pair of half-filled metal d orbital to empty antibonding pi orbital of COThe question was asked in exam.This question is from Bonding in Metal Carbonyls in portion Coordination Compounds of Chemistry – Class 12

Answer»

Correct ANSWER is (C) DONATION of electron pair of filled metal d orbital to empty antibonding pi orbital of CO

For explanation I would say: The pi bond involves donation of ELECTRONS from filled metal d ORBITALS into empty antibonding pi orbitals of CO. This is also called a back bond.



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