Chapter 23, Problem 4STP

Interpretation Introduction

Interpretation: To determine the functional group of the given compounds.

Concept Introduction: Functional group is represented as the group of atoms that form the molecule and are responsible for the chemical behavior. The functional groups mainly include hydrocarbons, haloalkanes, alcohol, carboxylic acid, carbonyl group, acyl halide, ester, and ether.

Answer to Problem 4STP

C − carboxylic acid.

Explanation of Solution

In any general formula representing the functional group, R represents the alkyl group that is attached to the functional group. ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{COOH}$ is in the form of $\text{RCOOH}$ which is the general formula for carboxylic acid. R represents the alkyl group which is ethyl in this case. Therefore, the given compound is carboxylic acid.

Conclusion

Carboxylic acids have an important role. They act as building blocks of fatty acids which is important for human health. They are also used in the manufacture of soaps and also soft drinks.