in metal carbonyls of formula M(CO)x (which follows EN rules) if M is Ni,Fe,Cr the value of x will be 1.6,5,6 2.4,5,6 3.4,4,5 4,4,6,6

Q. In the metal carbonyls of general formula $M{\left(CO\right)}_x$ if $M$ is $Ni,Fe$ and $Cr$ the value of $x$ will be respectively:

Q. In the metal carbonyls of general formula $M(CO{)}_n$ (which follows effective atomic number rule) if M is $Ni$, $Fe$ and $Cr$ then the value of $n$ will be respectively:

Q. Metal carbonyls can have formula $M\left(CO{)}_x\right)$, where $x=$ number of $CO$ units coordinated to metal $M$.

Q. In the metal carbonyls of the general formula $M{\left(CO\right)}_x$ where M = metal, x = 4, EAN rule satisfied for atomic number of M equal to :

Q. Suppose that metal carbonyls follow the $EAN$ rule, find the value of $x$ in the $Fe(CO{)}_x$: