Which of the following statements is not correct ?
A. 5% aqueous solutions of NaCl and KCl are said to be isomolar
B. 1 M sucrose solution and 1 M glucose solution are isotonic
C. Molecular mass of acetic acid and benzoic acid is higher than normal mass in cryoscopic methods.
D. For the same solution, `(DeltaT_b)/(DeltaT_f)=K_b/K_f`