Question

A molecule XY2 contains 2 sigma bonds, 2 pi bonds and one lone pair of electrons in the valence shell of X. The geometry is?
A) square pyramidal
B) linear
C) trigonal planar
D) bent

Pls give a detailed explanation as well.

Answer 1

Trigonal planar..

you can think about S02.

Answer 2

Answer: Option (C) is the correct answer.

Explanation:

A molecule that contains two sigma bonds and two lone pair of electrons in the valence shell with one lone pair of electron will have a bond angle of around 120 degrees. Geometry of this molecule will be trigonal planar.

For example, $SO_{2}$ molecule will have two oxygen bonds bonded with two double bonds and one lone pair of electrons.

Therefore, its geometry is trigonal planar.

In square pyramidal, there are 5 bonding electron pairs and one lone pair of electron with a bond angle of less than 100 degrees.

A linear geometry molecule has a bond angle of 180 degrees in total three atoms.

A bent molecule has three molecules with two sigma bonds and a lone pair of electron with a bond angle of aroun 109 degrees. For example, water has bent geometry.

Thus, we can conclude that the geometry of given compound is trigonal planar.