The octane number can be improved by $...............$.

Given below are two statements for the following reaction sequence.
Statement $I$: Compound $'Z'$ will give yellow precipitate with $NaOI$.
Statement $II$: Compound $'Q'$ has two different types of $'H'$ atoms (aromatic : aliphatic) in the ratio $1 : 3$.
In the light of the above statements, choose the correct answer from the option given below:

Product $(A)$ is

The correct statement is

What is the number of moles of $sp^2$ hybrid carbon atoms in one mole of $hexa-1,4-diyne$?

The double bond equivalent $(DBE)$ of cubane is: