Question

how to convert ethyne to propyne

Answer 1

Attached is the answer to the question.

Answer 2

Here is how ethyne is converted into propyne with this simple chemical reaction:

HC = CH + NaNH2 (liquid NH3 -> 196k HC = C- Na+ + NH3 
HC = C- Na+ + CH3 Br -> HC = C - CH3 + NaBr

Hope this helps you!