b$.($i$)$ Draw the structure of the products $D$ and $E$ in the following reactions, Figure $5.$

MeOH

$($i$)$

$(2$ equivalents$)$

${?}_{H^{+}\text{c}\text{a}\text{t}\text{a}\text{l}\text{y}\text{s}\text{t}}^{C_6{H}_{14}{O}_2}+H_2^{+H^{-}}$

$($ii$)$ Discuss the mechanism for any one of the reactions in Figure $5.$