Which of the following statements are CORRECT?I. Esters are sweet smelling substance.II Esters are used in making perfumes.III. Functional group of ester is R-O-R'.

Analysis of the statements:Statement I and II are correct: Esters are characterized by pleasant, fruity, or sweet smells and are widely used in manufacturing perfumes, artificial flavorings, and cosmetics.Statement III is incorrect: The functional group of an ester is $\text{R-COO-R’}$. The formula $\text{R-O-R’}$ represents an ether group.Therefore, only statements I and II are correct.