Which of the following is $NOT$ a hydrocarbon?

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:

Gasoline has a composition of:

$A$ isomerises to $B$ on addition of traces of acid $H_2SO_4$. Compound $(B)$ is

What are the bond enthalpies and bond lengths between carbon and carbon atoms in alkanes and alkenes?

Product of which of the following reactions is a racemic mixture?