Which product is formed when sodium phenoxide is heated with ethyl iodide?

For the reaction: $CH_3-CH(CH_3)-O-CH_3 + HI \rightarrow X + Y$,identify $X$ and $Y$.

Which of the following compounds when heated with $CO$ at $150^{\circ} C$ and $500 \ atm$ pressure in the presence of $BF_3$ forms ethyl propionate?

The reaction of $2,2-$dimethyltetrahydrofuran with $HBr$ gives:

In which of the following reactions is the product an ether?

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