Complete the following reactions:

a$.$

$+2C{H}_{3}C{H}_{2}OH{?}_{-H_{2}O}^{H^{+}}$

b$.$

${?}_{2.HCl(dilute),H_{2}O}^{\{\begin{array}{cc}\text{:}[1.C{H}_{3}MgBr,& ]\\ \text{E}\text{t}\text{h}\text{e}\text{r}\end{array}}$

Notes:

This is a two$-$step reaction. It may be beneficial to draw the product of step #$1,$ then consider the second reaction.

Step #$2$ is performed under very mild conditions in order to avoid formation of a tertiary carbocation.