Question

structural formula of two homologous of propanoic acid

Answer 1

What's found in your gastrointestinal tract and dairy products and is used as antifungal agent? It's propanoic acid, also called propionic acid. If you were to see and smell the isolated version of this chemical compound, you wouldn't like it. It's a clear, colorless and oily liquid. It also has a sharp rancid odor to it and it produces irritating vapors as well. If you were to taste it, you'd describe it as sour and a bit cheese-like in nature. Of course, that isn't recommended. Just stick to the Gouda instead.
What's recommended is that you continue reading this lesson to find out this compound's structure, formula and uses.

Structure & Formula

The chemical formula for propanoic acid can be either of the following although the first is more commonly used:

C3H6O2 or CH3CH2COOH

The C stands for carbon. The H refers to hydrogen. The O is for oxygen.
Just like propanoic acid has two different formulas, its structure can be ultimately demonstrated in multiple ways, either two dimensionally or three dimensionally as shown in the images herein