C. the solubilites in water of hexane, 1-butanol and 1-propanol; describe the ki

Question

C. the solubilites in water of hexane, 1-butanol and 1-propanol; describe the kinds of intermolecular interactions that occur between these molecules and between the molecules and water; explain the structual bases for these interactions.

3. sing the data in the table below, explain the structural bases for the differences in boiling points or solubilities as asked for the following sets of compounds: Compound Boiling Point (oC) Solubility in Water 1,5-hexadiene Insoluble 60 Insoluble 2,4-hexadiene 1,5-hexadiyne Insoluble 130 Insoluble 2,4-hexadiyne 69 Insoluble hexane 110 Slightly soluble 1-butanol 1-propanol Very soluble A. the boiling points of hexane, 1-propanol and 1-hexanol describe the kinds of intermolecular interactions that occur between molecules of the compounds and explain their structural bases. 3 continued on next page

Explanation / Answer

B. Intermolecular forces existing in 1,5-hexadiene molecules would be london dispersiontypes of forces. Whereas, in 2,4-hexadiene there is london dispersion and dipole-dipole interaction between the alkenic bonds.

C. The intermolecular forces between hexane, a non-polar moelcule is london dispersion type forces. Whereas, in polar 1-butanol and 1-propanol as like in water hydrogen bonding exists between their molecules. When water is mixed with either 1-butanol or 1-propanol, hydrogen bonding between the two is formed. Whereas, no such force of attarction is between polar water and non-polar hexane and thus these two do not mix with each other.

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