On the basis of intermolecular forces of attraction, rank the following three compounds in terms of increasing boiling point . CH₃CH₂OH, CH₃OCH₃ and CH₃CH₂CH₃

Question

Quizplus · Accepted Answer

The boiling point of a compound is dependent on the strength of intermolecular forces present. On analyzing the given compounds, it can be seen that they are all organic molecules with nonpolar/ polar covalent bonds. CH₃OCH₃ and CH₃CH₂CH₃ contain similar polar covalent bonds, and their boiling points are primarily decided by dispersion forces. However, CH₃CH₂OH contains a polar covalent bond and hydrogen bonding due to the presence of -OH group. The hydrogen bonding leads to higher intermolecular forces and hence a higher boiling point. Thus, the correct order of boiling point is CH₃CH₂CH₃ < CH₃OCH₃ < CH₃CH₂OH. Therefore, option C is the best choice.

On the Basis of Intermolecular Forces of Attraction, Rank the Following