Explain the difference in boiling points in the following pairs of compounds:
i. The boiling point of ethanol (78 °C) is lower than methanediol (192 °C).
ii. The boiling point of ethanamine (17°C) is lower than ethanol (78 °C).

• A. i. Methanediol has a higher molar mass.ii. Ethanol has a higher molar mass. 
• B. i. The molecules of methanediol have more hydrogen bonds between them.ii. The molecules of ethanol form stronger hydrogen bonds between them. 
• C. i. Methanediol has a higher molar mass.ii. The molecules of ethanol form stronger hydrogen bonds between them. 
• D. i. The molecules of methanediol have more hydrogen bonds between them.ii. Ethanol has a higher molar mass. 

Answer: (B)