CH₃Br + Nu^- $$\to$$ CH₃ - Nu + Br^- The decreasing order of the rate of the above reaction with nucleophiles (Nu^–) A to D is
[Nu^– = (A) PhO^–, (B) AcO^–, (C) HO–, (D) CH₃O^–]

In Langmuir’s model of adsorption of a gas on a solid surface

Total volume of atoms present in a face-centre cubic unit cell of a metal is (r is atomic radius) :

Among the following mixtures, dipole-dipole as the major interaction, is present in