The van der Waal's constants for three gases R, S and T are given below <br><br>Gas | | <br>R | 5.2 — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

Ease of liquefaction fundamentally depends directly on the strength of intermolecular attractive forces, captured primarily by constant '$a$'. Lighter forces (lower $a$) make a gas harder to liquefy. Order of $a$: T (2.3) < S (3.8) < R (5.2). The sequence starting with the most difficult (lowest $a$) is T, S, R. Therefore, correct answer is C.