Explanation: A Base is defines as the species which can accept positive species and donate its negative species.
It can also be defined as the species which can release hydroxide ions when dissolved in water. These are basically known as the Arrhenius bases.
Thus out of given options, alcohol (ROH) is the correct option which is not a base as it can donate its proton due to the fact that the hydrogen is attached to the electronegative atom oxygen making it a acidic proton.
Potassium hydroxide (KOH) and Sodium Hydroxide (NaOH) are basic in nature as these are the ionic species which releases hydroxide ions.
