Arrange the following gases in increasing order of vander Waals constant ‘a’
(A) Ar, (B) CH₄, (C) H₂O, (D) C₆H₆
Choose the correct option from the following

With increasing size, molecular interactions, increases, hence ‘a’ also increase

Vanderwaal constant – ‘a’  (i) Ar = 1.34  (ii) CH₄ = 2.25  (iii) H₂O = 5.46  (iv) C₆H₆ = 18.57

  ‘a’ symbolises force of attraction and directly proportional to surface area