Ozonolysis of acetylene $(HC \equiv CH)$ gives:

The major product obtained from the following reaction is

Which hydrocarbon can react with sodium in liquid ammonia?

$1, 2-$dibromoethane when heated with alcoholic potash gives

The final product of the following reaction is .......
$CaO + 3C$ $\xrightarrow{\text{Heat}} A$ $\xrightarrow{H_2O} B$ $\xrightarrow{H_2SO_4, Hg^{2+}} C$

The trend in acidic behaviour of the following hydrocarbons is:
$a: HC \equiv CH$
$b: CH_2 = CH_2$
$c: CH_3 - CH_3$
$d: CH_3 - C \equiv CH$