Consider the following sequence of reactions. Z PCl₅ → X Alc. KOH →...

When ${CH}_{3}{CHOHCH}_{3}$ is reacted with ${PCl}_{5}$, 2-Chloropropane is formed. Thus, X is 2-Chloropropane ${CH}_{3}{CHClCH}_{3}$.

When ${CH}_{3}{CHOHCH}_{3}$ is reacted with alc. KOH , Propene& is formed. Thus, Y is ${CH}_{3} - CH = {CH}_{2}$.

When ${CH}_{3} - CH = {CH}_{2}$ is treated with conc. ${H}_{2}{SO}_{4}$ and ${H}_{2}O$, 2-Propanol ${CH}_{3}{CHOHCH}_{3}$ is formed. Thus Z is ${CH}_{3}{CHOHCH}_{3}$.