Answer the following question given this paragraph: 

Unlike ethers, esters have a carbonyl group. Unlike carboxylic acids, esters have no acidic hydrogen atom; they have a hydrocarbon group in its place.


Q: Carboxylic acids have an acidic hydrogen atom, but esters do not. what do esters have in place of an acidic hydrogen atom?

 Choices:

- synthesis group

- carbonation group

- crystallization group

- hydrocarbon group

A:
hydrocarbon group
