The decreasing order of viscosity is
HOCH2CH(OH)CH2OH > HOCH2CH2OH > CH3CH2CH2OH.
The viscosity of a fluid is defined as a measure of its resistance to the deformation at a given rate.
Viscosity is also defined as the resistance offers by one layer of liquid to the another layer of fluid.
Physically, we can see the liquid which is more concentrated have more viscosity and the liquid with less concentration have less viscosity.
In general, viscosity increase as the force of attraction between moles goes on increasing.
More H bonding indicate more attraction between molecules
So, they can easily moved. Hence, as H bonding increasing the viscosity of the substance also goes on increase.
Thus, we concluded that the decreasing order of viscosity is
HOCH2CH(OH)CH2OH > HOCH2CH2OH > CH3CH2CH2OH.
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