Multiple choice

What is the IUPAC name of C2H5COOH?

  1. methanoic acid

  2. ethanoic acid

  3. propanoic acid

  4. none of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

C2H5COOH contains three carbon atoms (two in the ethyl group and one in the carboxyl group). According to IUPAC nomenclature for carboxylic acids, a three-carbon acid is called propanoic acid (prop- for three carbons, -anoic acid for carboxylic acid).