Which among the following statements is $NOT$ true about aliphatic compounds?

Which of the following is an incorrect statement about the heats of combustion?

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 $(B)$ is

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

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