The donation of lone pair of electrons of CO carbon into the

the-donation-of-lone-pair-of-electrons-of-co-carbon-into-the

The donation of lone pair of electrons of CO carbon into the vacant orbital of metal atom results in _________ bond.

A. sigma

B. pi

C. back

D. synergic

I had been asked this question by my school principal while I was bunking the class.

I would like to ask this question from Bonding in Metal Carbonyls in portion Coordination Compounds of Chemistry – Class 12

Right choice is A. sigma

The explanation is: Synergic bonding is the overall effect of the sigma and pi interactions in metal carbonyl bonds. M-C pi bonds are also known as back bonding.