In $Fe_2(CO)_9$,the two iron atoms are

The correct structural formula of Zeise's salt is

$CH_3MgI$ is an organometallic compound due to

Select the $IUPAC$ name for the complex $Fe(C_5H_5)_2$.

Which one is an organometallic compound?

The correct statements about metal carbonyls are:
$A$. The metal-carbon bonds in metal carbonyls possess both $\sigma$ and $\pi$-character.
$B$. Due to synergic bonding interactions between metal and $CO$ ligand, the metal-carbon bond becomes weak.
$C$. The metal-carbon $\sigma$ bond is formed by the donation of a lone pair of electrons on the carbonyl carbon into a vacant orbital of metal.
$D$. The metal-carbon $\pi$ bond is formed by the donation of electrons from a filled $d$-orbital of metal into a vacant $\pi^*$ orbital of $CO$.
Choose the correct answer from the options given below: