Question

What is the molecular geometry of $BC{l}_3$ ? Draw its VSEPR and Lewis structure.

Answer 1

Hint: VSEPR theory is basically used to predict the shape of molecules by using systematic steps. Whereas, lewis structure is also known as lewis dots, it is a representation of valence electrons in a given molecule.

Complete answer:
Let's first try to draw the Lewis structure of trichloride. It has three chlorine atoms and only one boron so boron will be a central atom in this molecular structure.

In this Lewis structure every chlorine has three lone pairs of electrons around it.
That is why it has $s{p}^2$ hybridisation so the molecular geometry will be trigonal planar and the bond angle will be ${120}^o$ .
So the VSEPR structure will look something like this:

Note:
VSEPR is valence shell electron pair repulsion, it simply tells us that nonbonding and bonding electron pairs of the central atom in a molecule push each other away from each other in $3D$ space due to which molecules acquire their individual molecular shapes.