Explain the reaction of boron trifluoride and diethyl ether.

What is $\mathrm{X}$ in the following change?

What are the products formed in the following reaction?

Write structural formulae of products obtained in the following reactions:

(p) ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{OCH}}_3\underset{{\mathrm{CH}}_3\mathrm{COOH}}{\overset{{\mathrm{Br}}_2}{\to }}$

(q) ${\mathrm{CH}}_3{\mathrm{COCH}}_3\stackrel{\mathrm{conc}. {\mathrm{H}}_2{\mathrm{SO}}_4}{\to }$

How will you obtain ethyl chloride from diethyl ether.

Write down the products of the following reaction?

${\mathrm{CH}}_3{\mathrm{OCH}}_2{\mathrm{CH}}_3\underset{\mathrm{Heat}}{\overset{\mathrm{conc}.\mathrm{HI}}{\to }}$