$2-$Butyne reacts with $Na$ in liquid $NH_3$ to form:

When $2$-butyne is treated with $Pd-BaSO_4$ (Lindlar's catalyst),the product formed will be:

Given below are two statements:
Statement $I$: One mole of propyne reacts with excess of sodium to liberate half a mole of $H_2$ gas.
Statement $II$: Four $g$ of propyne reacts with $NaNH_2$ to liberate $NH_3$ gas which occupies $224 \ mL$ at $STP$.
In the light of the above statements,choose the most appropriate answer from the options given below:

The major product formed in the oxidation of acetylene by alkaline $KMnO_4$ is:

The isomerisation of $1-$butyne to $2-$butyne can be achieved by treatment with

The $C - H$ bond length is minimum in the bond formed by