Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

D. C=O

Explanation:

Esters are formed by the condensation of alcohols and acids with minus water. During the reaction, at least one -OH group is replaced by an O- alkyl group. The resulting compound is an ester and has a characteristic fruity smell. Its functional group is C=O

A. -COO-

Explanation:

Functional groups are specific group of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules.

A. Esters have functional group .

Example: methyl ethanoate with molecular formula

B. Aledydes have functional group .

Example: Ethanal with molecular formula

C. Acids have functional group .

Example: Ethanoic acid with molecular formula

D. Ketones have functional group .

Example: Propanone with molecular formula