Seema Saini Solutions for Chapter: Alkynes, Exercise 2: DPP

An alkyne ${\mathrm{C}}_7{\mathrm{H}}_{12}$ when reacted with alkaline ${\mathrm{KMnO}}_{4 }$,followed by acidification by $\mathrm{HCl},$ yielded a mixture of

and ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COOH}$. The alkyne is:

On passing vinyl acetylene into conc. $\mathrm{HCl}$ in the presence of cuprous and ammonium chlorides, the following is produced:

When acetylene is passed into methanol at $160-200°\mathrm{C}$ in the presence of a small amount of potassium methoxide and under pressure, the following is formed:

Propyne on oxidation with ${\mathrm{SeO}}_2$ gives:

Westrosol is a solvent and it is prepared by:

An organic compound decolourises bromine in ${\mathrm{CCl}}_4$ and can be reduced catalytically. Also, it gives a precipitate with ammoniacal cuprous chloride. The compound can be:

Acetylene reacts with HCN in the presence of Ba(CN)₂ to yield: