alleryIn metal carbonyls, the M-C pi bond forms by electron donation from:
Aa filled metal d orbital into CO π*
Bthe oxygen lone pair into a metal orbital
Ca CO π orbital into an empty metal s orbital
Dthe carbon lone pair into a metal orbital
Answer & Solution
Correct answer: A. a filled metal d orbital into CO π*
Back donation from filled metal d orbitals into the empty π* orbital of CO makes the pi bond and strengthens the M-C link synergically.
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