Problem: Which type of intermolecular force accounts for each of these differences? (a) Acetone, (CH3)2CO, boils at 56°C; dimethyl sulfoxide or DMSO, (CH3)2SO, boils at 189°C. (b) CCl4 is a liquid at atmospheric pressure and room temperature, whereas CH4 is a gas under the same conditions. (c) H2O boils at 100°C but H2S boils at -60°C. (d) 1-propanol boils at 97°C, whereas 2-propanol boils at 82.6°C. Explain your answers.

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We are being asked to determine the intermolecular force accounting for each of the following differences.

(a) Acetone, (CH3)2CO, boils at 56°C; dimethyl sulfoxide or DMSO, (CH3)2SO, boils at 189°C. 

(b) CCl4 is a liquid at atmospheric pressure and room temperature, whereas CH4 is a gas under the same conditions. 

(c) H2O boils at 100°C but H2S boils at -60°C. 

(d) 1-propanol boils at 97°C, whereas 2-propanol boils at 82.6°C. 


Intermolecular Forces (IMF) are the attractive forces between 2 molecules.

Ion-dipole

strongest IMF
 deals with the attraction between an ion and a polar compound.

 Hydrogen Bonding

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Problem Details

Which type of intermolecular force accounts for each of these differences? 

(a) Acetone, (CH3)2CO, boils at 56°C; dimethyl sulfoxide or DMSO, (CH3)2SO, boils at 189°C. 

(b) CCl4 is a liquid at atmospheric pressure and room temperature, whereas CH4 is a gas under the same conditions. 

(c) H2O boils at 100°C but H2S boils at -60°C. 

(d) 1-propanol boils at 97°C, whereas 2-propanol boils at 82.6°C. 

Explain your answers.

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