Question

Write the IUPAC name of ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COOH}$.

Answer 1

Step 1: Determination of root word:

1. Choose the chain with the maximum Carbon atoms.
2. Because there are three Carbon atoms in this chain, the root word will be "Prop."

$\stackrel{3}{\mathrm{C}}{\mathrm{H}}_3\stackrel{2}{\mathrm{C}}{\mathrm{H}}_2\stackrel{1}{\mathrm{C}}\mathrm{OOH}$

Step 2: Determination of names and position of Locants:

1. In the given chain one Carboxylic group or Carboxyl group is present.

Step 3: Determination of suffix and prefix:

1. As this compound is saturated and the functional group is the Carboxylic group, the suffix is “oic acid”
2. "Propane" is used as a prefix in IUPAC names for three Carbon atoms.

Therefore, IUPAC name of ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COOH}$ is Propanoic acid.