Which of the following reacts with acetylene to form the war gas Lewisite?

The reagent for the reaction $R-CH_2-CCl_2-R \xrightarrow{\text{reagent}} R-C \equiv C-R$ is:

$2-$butyne is reduced to $trans-but-2-ene$ using:

How can propyne and propene be distinguished?

Choose the sequence of steps that describes the best synthesis of but$-1$-ene from ethanol.

The reaction sequence is as follows:
$CH(COOK)=CH(COOK)_{(aq)}$ $\xrightarrow{\text{electrolysis}} X$ $\xrightarrow[Hg^{2+}]{dil. H_2SO_4} Y$; $Y$ is