Answer
A. ethyl butanoate
Step-by-step explanation:
Esters are known for their distinctive odors and are commonly used for food aroma and fragrances. The general formula of an ester is RCOOR'.
Esters are formed through reactions between an acid and an alcohol with the elimination of water.
Esters are named as if the alkyl chain from the alcohol is a substituent. No number is assigned to this alkyl chain. This is followed by the name of the parent chain from the carboxylic acid part of the ester with an –e remove and replaced with the ending –oate.
Hence, the name of the given ester is:
A. ethyl butanoate