Ethylidene dichloride is obtained by the reaction of excess of $HCl$ with

$1$-Alkyne and $2$-alkyne can be distinguished by

$X$ (Symmetrical alkyne) $\xrightarrow{Hg^{2+}/H_3O^{+}}$ $2-$butanone. Which compound reacts with $Ag$ powder to give $X$?

In the given reactions,identify $A$ and $B$.

Which of the following reactions gives $H_2C=C=C=CH_2$?

The hydrocarbon which can react with sodium in liquid ammonia is