Which of these hydrocarbons is an ester?
A chain beginning with H and continuing with 6 carbons; O is double bonded to the first carbon.
A skeletal model of a chain of 9 carbons, with the last carbon single bonded to O H, and double bonded to O.
A skeletal model of a chain of 4 carbons, an O, and 4 more carbons. The fourth carbon is double-bonded to an O.
A chain beginning with O H and continuing with 8 carbons; O is double bonded to the first carbon.
