The hybridisation of oxygen in diethyl ether is

Consider the following reaction: $CH_3-C(CH_3)_2-O-CH_3 \xrightarrow{HI (1 \text{ mole})} \text{Products}$. The main products of the reaction will be:

Identify $A$ and $B$ in the following reaction: $C_6H_5CH_2-O-C_6H_5 + HI \rightarrow A + B$

On the treatment of the following compound with a strong acid,the most susceptible site for bond cleavage is

Methoxybenzene on treatment with $HI$ produces

An aromatic ether is not cleaved by $HI$ even at $525 \ K$. The compound is