Question

Which of the following formula represents esters?

• A. R-OH
• B. R-COOH
• C. $R-{\mathrm{CH}}_2\mathrm{OH}$
• D. R-CO-O-R

Answer 1

The correct option is D R-CO-O-R

Esters are formed when carboxylic acids react with alcohols and undergo a condensation reaction with the elimination of a water molecule (dehydration). The reaction is known as esterification. Esters are represented by a formula of R-CO-O-R.
R-OH represents aliphatic alcohols.
R-COOH represents aliphatic carboxylic acids.
$R-{\mathrm{CH}}_2\mathrm{OH}$ is also a representation of aliphatic alcohols.