Which of the following would not rearrange to a more stable form?

Which of the following fractions of petroleum refining contains kerosene? (Boiling ranges in $^\circ C$ are given below)

For the following reaction scheme,percentage yields are given along the arrows. $x \ g$ and $y \ g$ are the masses of $R$ and $U$,respectively. (Molar mass of $H$,$C$,and $O$ are $1$,$12$,and $16 \ g \ mol^{-1}$ respectively). $(1)$ The value of $x$ is $(2)$ The value of $y$ is.

Which of the following will give a mixture of $cis$ and $trans-1,4-$dimethylcyclohexane upon catalytic hydrogenation?

What is the major product in the given reaction?

The octane number is ...........