Arrange the following compounds in order of increasing viscosity:
I) 1-propanol, CH3CH2CH2OH;
II) 1,2-propanediol, CH3CH(OH)CH2OH;
III) 1,2,3-propanetriol, (glycerol), HOCH2CH(OH)CH2OH.
◦ I, II, III
◦ II, III, I
◦ III, I, II
◦ III, II, I
◦ I, III, II