From Williamson's synthesis,the preparation of which of the following is possible?

Which of the following halogenated compounds is not used in Williamson$'$s synthesis?

Explain the preparation of ethers by dehydration of alcohols and its mechanism with a suitable example.

Write the names of reagents and equations for the preparation of the following ethers by $Williamson$ synthesis:
$(i)$ $1-Propoxypropane$
$(ii)$ $Ethoxybenzene$
$(iii)$ $2-Methoxy-2-methylpropane$
$(iv)$ $1-Methoxyethane$

The substances used for the preparation of ether by Williamson's synthesis are:

The compound $(CH_3)_3C-O-CH_3$ is best prepared by which of the following reactions?