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Pentanol (C₅H₁₁OH; M = 88.15 g/mol) has nearly the same molar mass as hexane (C₆H₁₄; M = 86.17 g/mol) but is more than 12 times as viscous at 20°C. Explain.

Answer :

Pentanol (C₅H₁₁OH; M = 88.15 g/mol) has nearly the same molar mass as hexane (C₆H₁₄; M = 86.17 g/mol) but is more than 12 times as viscous at 20°C because Given that both are of comparable sizes and shapes, the London forces ought to be comparable. Because of the hydrogen bonds formed by the -OH groups at the ends of the molecules, 1-pentanol is much more viscous.

H-bonds are known to have stronger intermolecular forces than dispersion forces. Thus, pentanol is 12 times more viscous than hexane at 20 C as a result of larger intermolecular interactions. It has a low heat of vaporization and low viscosity. Hexane's main drawbacks are that it is flammable and handling it requires special safety measures.

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