Final answer:
The correct answer d) Butanol. The alcohol from which the ester ethyl ethanoate was formed is ethanol (CH3CH₂OH), indicated by the 'ethyl' part of the ester's name.
Step-by-step explanation:
The name of the alcohol from which the ester shown was formed is 2-propanol (also known as isopropyl alcohol). According to the International Union of Pure and Applied Chemistry (IUPAC), the name of alcohol comes from the hydrocarbon from which it was derived.
The final -e in the name of the hydrocarbon is replaced by -ol, and the carbon atom to which the -OH group is bonded is indicated by a number placed before the name. So in this case, the ester was formed from 2-propanol, making the correct answer d) Butanol.