How will you distinguish between but-1-yne and but-2-yne ?

Explanation

But-1-yne `(CH_3CH_2C-=CH)` being a terminal alkyne reacts with a solution of ammoniacal silver nitrate `(AgNO_3)` to form a white precipitate of silver 1-butynide.
However, but-2-yne `(CH_3C-=C""CH_3)` being a non-terminal alkyne does not undergo this type of reaction. So, but-1-yne and but-2-yne can be distinguished by observing the result of the above mentioned test using ammoniacal silver nitrate solution.