Dado o esquema de síntese abaixo, identifique as estruturas e as funções dos principais produtos orgânicos formados ($I$, $II$, $III$, $IV$ e $V$).

$$\begin{gathered} (\mathrm{V})\stackrel{\text{Fenoˊxido de soˊdio}}{\leftarrow }\mathrm{CH}{}_3\mathrm{CH}{}_2\mathrm{CH}{}_2\mathrm{Br}\stackrel{\mathrm{HBr}}{\leftarrow }\mathrm{CH}{}_3\mathrm{CH}{}_2\mathrm{CH}{}_2\mathrm{OH}\underset{\mathrm{\Delta }}{\overset{\mathrm{H}{}_2\mathrm{SO}{}_4}{\to }}(\mathrm{I}) \\ \underset{\mathrm{H}{}_2\mathrm{SO}{}_4}{\overset{\mathrm{H}{}_2\mathrm{O}}{\to }}\mathrm{CH}{}_3\mathrm{CH}(\mathrm{OH})\mathrm{CH}{}_3\underset{\mathrm{H}{}_2\mathrm{SO}{}_4(\mathrm{dil})}{\overset{\mathrm{K}{}_2\mathrm{Cr}{}_2\mathrm{O}{}_7}{\to }}(\mathrm{II})\underset{\text{Tetraidrofurano seco}}{\overset{\mathrm{CH}{}_3\mathrm{MgBr}}{\to }}(\mathrm{III})\underset{\mathrm{HCl}(\mathrm{dil})}{\overset{\mathrm{H}{}_2\mathrm{O}}{\to }}(\mathrm{IV}) \end{gathered}$$