Final answer:
Sodium amide (NaNH2), lithium diisopropylamide (LDA), and sodium hydride (NaH) are strong bases that can deprotonate a terminal alkyne. Potassium hydroxide (KOH) cannot deprotonate a terminal alkyne.
Step-by-step explanation:
Terminal alkynes have acidic protons but they are weak acids (pKa ~25). In order to deprotonate a terminal alkyne, you would need a strong base. Sodium amide (NaNH2), lithium diisopropylamide (LDA), and sodium hydride (NaH) are all strong bases that can deprotonate a terminal alkyne. Potassium hydroxide (KOH) is not a strong enough base to remove all of the alkyne protons.