How many cyclic structures are possible for $C_4H_6$?

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:

What is the major product of the following reaction?
(Image of trans$-1,2-$dibromocyclohexane reacting with $NaNH_2$)

Gasoline is the name of

The petrol having octane number $80$ has

Which of the following compounds shall not produce propene by reaction with $HBr$ followed by elimination or direct only elimination reaction?