Relationship between osmotic pressure at 273 K when 1% glucose (π1), 1% urea (π2), 81% sucrose (π3) are dissolved in 1 litre of water:
π1, π2, π3 and π4 are the osmotic pressures of 5% (WV) solutions of urea, fructose, sucrose and KCl respectively at certain temperatures. The correct order of their magnitude is