Final answer:
Option C) C2H5OH is the molecular structure for ethanol, also known as ethyl alcohol, which is the correct answer to the student's question.
Step-by-step explanation:
To determine which molecule is ethanol, also known as ethyl alcohol, we need to look for the molecular structure that corresponds to the formula C2H5OH. Ethanol is a simple alcohol with two carbon atoms, six hydrogen atoms, and one hydroxyl group (-OH). Among the given options, option C) C2H5OH represents the structure of ethanol. On a structural level, ethanol can be written as CH3CH2OH. Ethanol is used to form esters such as ethyl acetate (CH3CO2CH2CH3) when reacted with acetic acid and is also known for its use in alcoholic beverages.