In laboratory burners,we use

The product $(B)$ is:

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 stereochemistry of the product formed in the following reaction?

The correct order of heat of hydrogenation of the given molecules is:

What is the major product of the following reaction?