Problem: How many pi bonds are formed when sp3 hybridization occurs in ethene, C2H4?

We’re being asked to determine thenumber of π bonds in C₂H₄. For this, we first need to draw the Lewis structure of C₂H₄. The steps in drawing Lewis structures are as follows:

Step 1: Determine the central atom in this molecule.

Step 2: Calculate the total number of valence electrons present.

Step 3: Draw the Lewis structure for the molecule.