i$.$ Write the products formed in the following reactions. $(16$ points$)$

$C{H}_{3}C{H}_{2}C{H}_{2}C{H}_{2}OH{?}_{H_{2}S{O}_4,H_{2}O}^{longrightarro{w}^{K_{2}C{r}_2{O}_7}}$

ii$.$ The following molecule reacts with $(C{H}_{3}C{H}_2{)}_{2}NH$ and $C{H}_{3}C{H}_{2}N{H}_2.$ Write the products formed. Classify the products. $(12$ points$)$

iii. Write the product after each arrow. $(12$ points$)$

iv$.$ Design efficient synthesis. Write the reagents needed and also steps and intermediate product if any. $(12$ points$)$