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Chapter 2: Q33 P (page 138)

Dimethyl ether and ethanol are isomers. Their boiling points are very different, however. Explain why these two compounds have dramatically different boiling points.

CH3-O-CH3 CH3CH2-OH

dimethyl ether, bp -24 掳C ethanol, bp 78 掳C

Short Answer

Expert verified

Ethanol have hydrogen bonding while dimethyl ether shows weaker intermolecular forces of attraction.

Step by step solution

01

Step 1:

Dimethyl ether have weaker intermolecular forces (weak dipole-dipole interactions) which required less energy to overcome the bond when compared to ethanol. And there are no hydrogen atoms directly attached to oxygen to form hydrogen bonds.

02

Step 2:

Ethanol have stronger Hydrogen bonding (it can accept one H-bond, and can donate one H-bond) which require more energy to overcome this bonding, which leading to a higher boiling point than dimethyl ether.

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