Which one of the following compounds is resistant to nucleophilic attack by hydroxyl $(OH^{-})$ ions?

Which reagent is used for the electrophilic aromatic bromination of methyl phenyl ether (anisole)?

In the following reaction,$C_2H_5OC_2H_5 + 4[H] \xrightarrow{\text{Red } P + HI} 2X + H_2O$,$X$ is

Which of the following cannot be prepared by Williamson synthesis?

An organic compound of molecular formula $C_4H_{10}O$ does not react with sodium. With excess of $HI$,it gives only one type of alkyl halide. The compound is

Given below are two statements $:$
Statement $I :$ Dimethyl ether is completely soluble in water. However,diethyl ether is soluble in water to a very small extent.
Statement $II :$ Sodium metal can be used to dry diethyl ether and not ethyl alcohol. In the light of given statements,choose the correct answer from the options given below