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

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

Which of the following on heating gives an ether as the major product?
$(P)$ $C_6H_5CH_2Br + CH_3ONa$
$(Q)$ $C_6H_5ONa + CH_3Br$
$(R)$ $(CH_3)_3CCl + CH_3ONa$
$(S)$ $C_6H_5CH=CHCl + CH_3ONa$

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.

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

Which among the following is the method for the preparation of ethers?