Question

Which one of the following is non-ideal solution
(a) Benzene + toluene
(b) n-hexane + n-heptane
(c) Ethyl bromide + ethyl iodide
(d) CCl₄ + CHCl₃

Answer 1

(d) CCl4 (nonpolar) + CHCl3 (polar)

In CCl4 the intermolecular attractions are London dispersion forces which are known to be weak compared to other types of intermolecular forces.

CHCl3 has dipole dipole forces which are known to be very strong.

Putting these two components together in a mixture results in dipole induced dipole interaction since dipole-dipole induced forces are not nearly as strong as the dipole-dipole interaction between chloroform molecules in a pure substance, carbon tetrachloride and chloroform mixtures are non ideal solution