Question

Acetylene is passed through tollens reagents

Answer 1

Tollen's reagent is most notable for its reaction with aldehydes to produce a silver mirror, but it also reacts with several other types of compounds, notably alpha-hydroxy ketones and terminal alkynes.

With terminal alkynes, the alkyne reacts as a acid to form a silver acetylide which precipitates. In the case of acetylene, both hydrogens can react:

HC≡CH+2AgNO3+2NH4OH⟶AgC≡CAg+2NH4NO3+2H2O

The colour of the precipitate is variously described as yellow, gray-white, or white. The actual colour you observe is probably strongly dependent on the purity of the sample and the size of the precipitated particles.

Answer 2

Explanation:

acylelene has two acidic hydrogens and it forms a organometallic complex with tollens reagent called disilveracytalide