The hybridisation of oxygen in diethyl ether is

In the given reaction,the product is:
$C_6H_5OH + C_2H_5I \xrightarrow{C_2H_5O^- / C_2H_5OH} \text{Product}$

$C_2H_5OH$ $\xrightarrow{Na} P$ $\xrightarrow{CH_3-Cl} Q$; $Q$ is

Consider the reaction of $HI$ with the following compounds:
$I$: Tetrahydropyran
$II$: Isochroman (or similar cyclic ether fused to benzene)
Which forms a di-iodide on reaction with $HI$ (excess)?

Williamson synthesis of ether is an example of

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