The $-C \equiv C-$ bond is found in

$CH_3COOH$ is reacted with $CH \equiv CH$ in the presence of $Hg^{2+}$,the product is:

Oxidation of propyne with $SeO_2$ gives ....

Which one of the following classes of compounds is obtained by the cyclic polymerization of acetylene?

An unknown compound $A$ has a molecular formula $C_4H_6$. When $A$ is treated with an excess of $Br_2$,a new substance $B$ with formula $C_4H_6Br_4$ is formed. $A$ forms a white precipitate with ammoniacal silver nitrate solution. $A$ may be

Acetylenyl hydrocarbons are acidic because ..