Answer
1. Water is more acidic than Acetylene.
2. And Hydroxal ion does not react with Acetylene.
Work Step by Step
EXPLAINATION.
Water is more acidic than Acetylene because pka value of water is far less than Acetylene in other words Acetylene is basic than water.
Hydroxal ion does not react with Acetylene because Acetylene ion is more basic than Hydroxal ion therefore acetylene does not donate proton to hydroxal ion.