Explain the following reaction of anisole.

Friedel Crafts alkylation.

Account for the following :

Preparation of ethers by acidic dehydration of secondary or tertiary alcohols is not a suitable method.

Give the IUPAC name for the following and classify them as simple or mixed.

Dibenzyl ether

$3,3$-dimethylbutan-$2$-ol on treatment with conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ to give tetramethyl ethylene as a major product. Suggest a suitable mechanism.

Identify the product in the following reaction. Write the $\mathrm{IUPAC}$ name and mention the mechanism involved in the reaction.

$\mathrm{Cyclopentanol}\underset{△}{\overset{ {\mathrm{H}}_2{\mathrm{SO}}_4 }{\to }}?$

Identify $\mathrm{A},\mathrm{B},\mathrm{C},\mathrm{D}$ and write the complete equation.