The permeability of molecules across a lipid bilayer depends on their size and solubility in a nonpolar solvent relative to their solubility in water. For the species $\mathrm{O}_2, \mathrm{H}_2 \mathrm{O}$, $\mathrm{K}^{+}$, glycerol and glucose, the order of their permeability across a lipid bilayer in the absence of any protein transporters is

• Correct answer
  A

  $\mathrm{O}_2 \gt \mathrm{H}_2 \mathrm{O} \gt $ Glycerol $\gt$ Glucose $ \gt \mathrm{K}^{+}$
• B

  $\mathrm{H}_2 \mathrm{O} \gt \mathrm{O}_2 \gt $ Glycerol $\gt$ Glucose $ \gt \mathrm{K}^{+}$
• C

  $\mathrm{O}_2 \gt \mathrm{H}_2 \mathrm{O} \gt $ Glucose $\gt$ Glycerol $ \gt \mathrm{K}^{+}$
• D

  $\mathrm{K}^{+} \gt \mathrm{O}_2 \gt \mathrm{H}_2 \mathrm{O} \gt $ Glycerol $\gt$ Glucose

Hence, the correct answer is option: 'A'.