Consider the 1M aqueous solution of the following compounds and arran…

The correct answer is Option (3) → A < B < C < D < E

Elevation of boiling point is a colligative property: it depends on the number of solute particles. For an electrolyte the van’t Hoff factor i is included:

    \( \Delta T_b = i\,K_b\,m \)

All the solutions have the same concentration and the same solvent (water), so ΔT_b increases with i, the number of particles given by one formula unit on complete dissociation:

• A. C₆H₁₂O₆ — non-electrolyte, does not dissociate; i = 1

• B. NaCl — \( \ce{Na^{+}} \) + \( \ce{Cl^{-}} \); i = 2

• C. MgCl₂ — \( \ce{Mg^{2+}} \) + \( \ce{2Cl^{-}} \); i = 3

• D. AlCl₃ — \( \ce{Al^{3+}} \) + \( \ce{3Cl^{-}} \); i = 4

• E. Al₂(SO₄)₃ — \( \ce{2Al^{3+}} \) + \( \ce{3SO4^{2-}} \); i = 5