Diethyl ether and methyl $n$-propyl ether are:

Identify the products $(X, Y)$ and reaction mechanism $(Z)$ of the following reaction:
$CH_3CH_2-O-C(CH_3)_2CH_2CH_3 \xrightarrow{HI, \Delta} X + Y$

The reaction of chloroethane with $Y$ gives $NaCl$ and $Z$. The reaction of one mole of $Z$ with two moles of $HI$ gives water and iodoethane. What is $Y$?

In the reaction $Ar-OH + RX \xrightarrow{\text{alkali}} A$,$A$ is

The maximum number of isomeric ethers with the molecular formula $C_4H_{10}O$ is

The product in the reaction (figure) $+ HBr$ is