Final answer:
The alkynes that give a single ketone in an acid-catalyzed hydration are propyne, butyne, pent-1-yne, and hex-1-yne.
Step-by-step explanation:
The alkynes that give a single ketone in an acid-catalyzed hydration are A. Propyne, B. Butyne, C. Pent-1-yne, and D. Hex-1-yne. When alkynes undergo acid-catalyzed hydration, they first form an enol intermediate, which contains a C=C double bond and an -OH group.
This enol intermediate then undergoes tautomerization to form the corresponding ketone.