The reaction used for the synthesis of ether is

$CH_3-Br + NaO-C(CH_3)_3 \to ?$

Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. Give reason.

Write the reactions of Williamson synthesis of $2-$ethoxy$-3-$methylpentane starting from ethanol and $3-$methylpentan$-2-$ol.

Give the names of the reagents and equations for the preparation of the following ethers by Williamson synthesis:
$(i)$ Methoxybenzene $(ii)$ Methoxyethane $(iii)$ Ethoxybenzene $(iv)$ Ethoxyethane

Ethers can be prepared by Williamson synthesis in which an alkyl halide is reacted with sodium alkoxide. Di-tertiary ether cannot be prepared by this method. Explain.