A solution of acetone in water show negative deviation from Raoult’s law, Which of the following statement regarding this solution is incorrect ?

Options

A. The mixing of acetone in water is exothermic
B. Acetone-water molecule are held less firmly than acetone-acetone and water-water molecule
C. Observed boiling point will be slightly greater than the ideal boiling point
D. Vapour pressure of the solution will be slightly lower than that predicted from Raoult.s law

Answer

B

Explanation

`CH_(3)-underset(A)overset(O)overset(||)(C)-CH_(3)+underset(B)(H_(2)O)`
A----A (dipole-dipole) & B-----B & A-----A & B-----B (H-bonding)
Basic oxygen of acetone help it to form strong H-bond with either of two acidic protons of water.