$\mathrm{X}$ is the smallest optically active alkanol. On dehydration, it can form $\mathrm{Y}$ number of alkenes (including stereoisomers). On reaction with Lucas reagent, it forms $\mathrm{Z}$ number of alkyl halides (including stereoisomers). Identify the numbers $\mathrm{Y} \text{and} \mathrm{Z}$.

If the starting material is labelled with deuterium as indicated, predict the number of deuterium present in the major elimination product:

If the starting material is labelled with deuterium as indicated, predict the number of deuterium atoms present in the major elimination product?

How many moles of $\mathrm{MeMgI}$ (Me-methyl) will be consumed by one mole of the following compound?

What is D?

Which of the following is not expected to be the intermediate of the following reaction?