When calcium carbide is added to water,the gas that is evolved is

The reagent which could distinguish between $1-$hexyne and $1-$hexene is

When propyne reacts with aqueous $H_2SO_4$ in the presence of $HgSO_4$,the major product is

Which series of reagents can be used to convert acetylene into higher alkynes?

Calcium carbide $+ D_2 O \longrightarrow \underline{X} + Ca(OD)_2$.
The hybridisation of carbon atom$(s)$ in $X$ is:

The reagent used in the reaction $R-CH_2-CCl_2-R \xrightarrow{\text{Reagent}} R-C \equiv C-R$ is .............