Ethylidene dichloride can be prepared by the reaction of $HCl$ and

$C_2H_2$ $\xrightarrow[1\% HgSO_4]{dil. H_2SO_4} A$ $\xrightarrow{[O]} B$ $\xrightarrow{NaOH} C$ $\xrightarrow{NaOH/CaO} D$,$[D]$ is:

What will be $X$ in the following reaction?
${C_2}{H_2} \xrightarrow[{HgSO_4 / H_2SO_4, 60^{\circ}C}]{{H_2O}} X \rightleftharpoons CH_3CHO$

When acetylene is passed into dilute sulphuric acid containing $Hg^{2+}$ ions,the product formed is

Which of the following organic compounds has the same hybridization as its combustion product $(CO_2)$?

$CH_3CH_2CH_2I$ $\xrightarrow{alc. KOH} A$ $\xrightarrow{Br_2} B$ $\xrightarrow{NaNH_2 / NH_3} C$. In this reaction,$C$ is: