Acetylene is obtained by the electrolysis of

Choose the sequence of steps that describes the best synthesis of but$-1$-ene from ethanol.

Number of $\sigma$ and $\pi$ bonds present in $but-1-ene-3-yne$ respectively are

Assertion : Acetylene on reacting with sodamide gives sodium acetylide and ammonia.
Reason : $sp$ hybridised carbon atoms of acetylene are considerably electronegative.

Identify the alkyne in the following sequence of reactions:
Alkyne $\xrightarrow{\text{H}_2, \text{Lindlar's catalyst}} A$ $\xrightarrow{\text{Ozonolysis}} B \text{ (only)}$
Given that $B$ is obtained from $\text{CH}_2=\text{CH}_2$ via the Wacker process.

Hex$-1-$yne on reaction with $Br_2$ (excess)/ $CCl_4$,gives