${?}_{P5C\mathrm{.}4}1-$Butanol and chlorobenzene form a minimum boiling azeotropic system. The mole fraction of $1-$butanol in the liquid

$(x)$ and vapour $(y)$ phases at $1\mathrm{.}000$atm is given below for a variety of boiling temperatures $($H$.$ Artigas et al$.,$ J$.$ Chem. Eng.

Pure chlorobenzene boils at $404\mathrm{.}86K.($a$)$ Construct the chlorobenzene$-$rich portion of the phase diagram from the data. $($b$)$

Estimate the temperature at which a solution whose mole fraction of $1-$butanol is $0\mathrm{.}300$ begins to boil. $($c$)$ State the

compositions and relative proportions of the two phases present after a solution initially $0\mathrm{.}3001-$butanol is heated to

$393\mathrm{.}94K.$