Diethyl ether can be decomposed by heating with

An organic compound $'A'$ $(C_9H_{10}O)$ when treated with conc. $HI$ undergoes cleavage to yield compounds $'B'$ and $'C'$. $'B'$ gives a yellow precipitate with $AgNO_3$ whereas $'C'$ tautomerizes to $'D'$. $'D'$ gives a positive iodoform test. $'A'$ could be :

Identify the products $R$ and $S$ in the reaction sequence given:
$(CH_3)_3 COH$ $\xrightarrow{Na} P$ $\xrightarrow{CH_3 Br} Q$ $\xrightarrow[\Delta]{HI} R + S$

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

Among the compounds $I-IV$,the compound having the lowest boiling point is:

The main product of the following reaction will be: