Question

why carbon mono oxide CO whenever makes a bond with metal its bond energy increases??

Answer 1

whenever CO reacts with metals it donates its bonding electron to d orbitals intern takes back the some pie electrons from the metal into its antibonding orbitals due to this reason the bond energy of CO increases

Answer 2

thi pehenomenon is called cynergic effect

Answer 3

k..

Answer 4

CO has some electron density in an antibonding pi* orbital, donating to a metal removes these electrons partially which strengthens the bond.