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Chapter 12: Q12.63P (page 496)

Rank the compounds in Problem 12.61 in order of decreasing viscosity at a given temperature; explain your ranking.

Short Answer

Expert verified

On the basis of viscosity, at a given temperature the decreasing order of the mentioned compounds isOHCH2CH(OH)CH2OH>OHCH2CH2OH>CH3CH2CH2OH.

Step by step solution

01

Viscosity

The viscosity is the shear resistance of any liquid for deformation under external pressure.

02

H-bonding interactions

For the alcoholic compounds, the functional group 鈥揙H experiences strong H-bonding interactions. Considering the above compounds, there is a difference in these H-bonding interactions.

CH3CH2CH2OH has only one 鈥揙H bond, OHCH2CH2OH has two 鈥揙H bonds, whereas OHCH2CH(OH)CH2OHhas three 鈥揙H bonds. Hence, the H- bonding interactions are stronger inOHCH2CH(OH)CH2OHthanOHCH2CH2OH. Thus, the former will have more viscosity than the latter, and in this line, propanol will have the least viscosity.

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