What is the oxidation state of $Ti$ in the Ziegler-Natta catalyst?

The $V-C$ distance in $[V(CO)_6]$ and $[V(CO)_6]^-$ are respectively (in $pm$):

Which of the following has the longest $C-O$ bond length? (Free $C-O$ bond length in $CO$ is $1.128 \ \mathring{A}$.)

Which one is an organometallic compound?

Match List-$I$ with List-$II$:

$LIST-I$ (Substances)	$LIST-II$ (Element Present)
$A$. Ziegler catalyst	$I$. Rhodium
$B$. Blood pigment	$II$. Cobalt
$C$. Wilkinson catalyst	$III$. Iron
$D$. Vitamin $B_{12}$	$IV$. Titanium

Choose the correct answer from the options given below:

The bond length of the $C-O$ bond in carbon monoxide is $1.128 \ \mathring{A}$. The $C-O$ bond length in $Fe(CO)_5$ is ............. $\mathring{A}$.