Diethyl ether can be decomposed by heating with

Which of the following ethers cannot be synthesized by Williamson's ether synthesis?

In which of the following transformations is phosphorus pentachloride $(PCl_5)$ used as a reagent?

Methyl vinyl ether,$H_2C=CH-OCH_3$,reacts with $Br_2/CH_3OH$. If methanol is reacting as water would,and if this reaction follows a typical mechanism of electrophilic addition,what would be the expected product?

Which of the following compounds is resistant to nucleophilic attack by hydroxyl ions?

The reaction of $tert$-butyl methyl ether with one equivalent of $HI$ gives: