$C_2H_2 \mathop {}$ ${\xrightarrow{{HgSO_4, H_2SO_4}}} A$ $\xrightarrow{{[O]}} B$. $B$ is

The major product formed in the following reaction is

The reaction of $1,2$-dibromoethane with alcoholic potash yields.......

Give a brief note on the acidic nature of alkynes.

Which is the most suitable reagent among the following to distinguish compound $(iii)$ from the rest of the compounds?
$(i)$ $CH_3-C\equiv C-CH_3$
$(ii)$ $CH_3-CH_2-CH_2-CH_3$
$(iii)$ $CH_3-CH_2-C\equiv CH$
$(iv)$ $CH_3-CH=CH_2$

In the following series of chemical reactions,identify $Z$.
$C_3H_7OH$ $\xrightarrow[160-180\,^{\circ}C]{Conc. H_2SO_4} X$ $\xrightarrow{Br_2} Y$ $\xrightarrow{Excess \ of \ Alc. KOH} Z$