Diethyl ether finds use in medicine as

Which of the following compounds resists the reaction with the nucleophilic hydroxide ion?

Give $IUPAC$ names of the following ethers:
$(i)$ $C_2H_5OCH_2CH(CH_3)_2$
$(ii)$ $CH_3OCH_2CH_2Cl$
$(iii)$ $O_2NC_6H_4OCH_3(p)$
$(iv)$ $CH_3CH_2CH_2OCH_3$
$(v)$ $1$-Ethoxy-$4,4$-dimethylcyclohexane
$(vi)$ Ethoxybenzene

What is $X$ in the following reaction?

Williamson synthesis of ether is an example of

One mole of an organic compound $(A)$ with the formula $C_3H_8O$ reacts completely with two moles of $HI$ to form $X$ and $Y$. When $Y$ is boiled with aqueous alkali it forms $Z$. $Z$ answers the iodoform test. The compound $(A)$ is