Which of the following organometallic compound is `sigma` and `pi`-bonded?

Options

A. (a) `[Fe(eta^5-C_5H_5)_2]`
B. (b) `[PtCl_3(eta^2-C_2H_4)]`
C. (c) `[Co(CO)_5NH_3]^(2+)`
D. (d) `Al(CH_3)_3`

Answer

C

Explanation

`CO` ligand is bonded to the central metal atom through `sigma` and `pi`-bonding.