An ideal solution is prepared from A and B (both are volatile). The composition of the solution is such that the total vapour pressure is harmonic mean of vapour pressures of pure `A(P_(A)^(@))` and pure `B(P_(B)^(@)).[P_(A)^(@) ne P_(B)^(@)]`
If `x_(A), x_(B)` represents mole freaction of A and B in solution respectively and `y_(A) ` and `Y_(B)` represents mole fraction of A and b in vapour phase, then answer the following questions.
In the above comprehension, isothermal fractional distillation(s) will never form a solution :

Options

A. for which `y_(A)-x_(A)` is maximum
B. for which vapour pressure is geometric mean of pure v.p. of A and B
C. for which `y_(A) = y_(B)` and `y_(B) = x_(A)`
D. all of these

Answer

D