Non symmetrical internal alkyne on Kucherov reaction gives.

$$\begin{gathered} \text{ Note: } \\ \text{ (i) Acetylene }(\mathrm{CH}\equiv \mathrm{CH}\text{ ) gives acetaldehyde } \\ \text{ (ii) Terminal alkyne }(\mathrm{R}-\mathrm{C}\equiv \mathrm{CH}\left)\text{ gives }{\mathrm{RCOCH}}_3\text{ (Methyl ketone) } \\ \text{ (iii) Symmetrical internal alkyne }\right(\mathrm{R}-\mathrm{C}\equiv \mathrm{C}-\mathrm{R})\text{ gives a single ketone }\left({\mathrm{RCOCH}}_2\mathrm{R}\right) \end{gathered}$$