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

(N/A) $(i)$ $CH_3CH_2CH_2ONa$ ($Sodium$ $propoxide$) $+$ $CH_3CH_2CH_2Br$ $(1-Bromopropane)$ $\to$ $CH_3CH_2CH_2-O-CH_2CH_2CH_3$ $(1-Propoxypropane)$ $+$ $NaBr$
$(ii)$ $C_6H_5ONa$ ($Sodium$ $phenoxide$) $+$ $C_2H_5Br$ $(Bromoethane)$ $\to$ $C_6H_5-O-C_2H_5$ $(Ethoxybenzene)$ $+$ $NaBr$
$(iii)$ $CH_3-C(CH_3)_2-ONa$ ($Sodium$ $2-methylpropan-2-olate$) $+$ $CH_3Br$ $(Bromomethane)$ $\to$ $CH_3-C(CH_3)_2-OCH_3$ $(2-Methoxy-2-methylpropane)$ $+$ $NaBr$
$(iv)$ $CH_3CH_2ONa$ ($Sodium$ $ethoxide$) $+$ $CH_3Br$ $(Bromomethane)$ $\to$ $CH_3CH_2-O-CH_3$ $(1-Methoxyethane)$ $+$ $NaBr$