What type of alkyl halide are best suited for Williamson ether synthesis?

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.

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

When a $1^o$ alkyl halide reacts with an alkoxide,what is the product obtained?

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.