Multiple covalent bonds exist in a molecule of

Silicon has $4$ electrons in the outermost orbit. In forming the bonds,

The skeletal structure of $CH_{3}COOH$ as shown below is incorrect because some of the bonds are represented wrongly. Write the correct Lewis structure for acetic acid.

What is the formal charge on sulfur in the following Lewis structure?

The internuclear distances in $H_2$ and $Cl_2$ molecules are $74 \, pm$ and $198 \, pm$ respectively. What will be the bond length of $HCl$ in $pm$?

When two pairs of electrons are shared,the bond is