Propyne→∆Na X +12H2                  X →∆CH3IY  Now, which of the following reagents can be used to distinguish Y from propyne?

Propyne is a terminal alkyne and exhibits acidic character,hence they gives +ve test with NH4OH+AgNO3 and NH4OH+Cu2Cl2Where as Y[but-2-yne] is a internal alkyne,it does not contain acidic hydrogen,hence it does not give +ve test with the above two reagents.