HOH +RONa$\to$  NaOH + ROH

             Stronger acid                         Weaker acid

Similarly, when sodium ethynide is treated with water and alcohol, then acetylene is obtained.
                         HOH + CH $\equiv$ CNa$\to$HC$\equiv$ CH+ NaOH

                  Stronger acid                       Weak acid

                        ROH + HC $\equiv$ CNa $\to$ HC$\equiv$CH + RONa
                 Stronger acid                        Weak acid

Thus, water and alcohol are stronger acid than ethyne and the decreasing order of acidity of given compounds are

                              HOH > ROH > HC$\equiv$CH