The major product ' $Y^{\prime}$ in the given sequence of reactions is

$$ \mathrm{C}_3 \mathrm{H}_7 \mathrm{OH} \xrightarrow[443 \mathrm{~K}]{\text { Conc. } \mathrm{H}_2 \mathrm{SO}_4} X \xrightarrow[\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CO}\right)_2 \mathrm{O}_2]{\mathrm{HBr}} Y $$

The number of -OH groups present in the structures of bithionol, terpineol and chloroxylenol is respectively

Identify the products $R$ and $S$ in the reaction sequence given

$\left(\mathrm{CH}_3\right)_3 \mathrm{COH} \xrightarrow{\mathrm{Na}} P \xrightarrow{\mathrm{CH}_3 \mathrm{Br}} Q \xrightarrow[\Delta]{\mathrm{HI}} R+S$

Arrange the following in the correct order of their boiling points.