Question

Consider the structural formulas for methanol, CH3OH, and ethane, C2H6. Which has a higher melting point and which statement substantiates the answer?

A. Methanol; it forms stronger hydrogen bonds compared to ethane.
B. Ethane; it has a more symmetrical structure, leading to stronger van der Waals forces.
C. Methanol; its molecular weight is higher, leading to stronger intermolecular forces.
D. Ethane; it has a simpler structure, resulting in weaker intermolecular forces.

Answer 1

Methanol has a higher melting point than ethane because it can form stronger hydrogen bonds.

Step-by-step explanation:

The melting point and boiling point for methanol (CH3OH) is predicted to be significantly higher than that of ethane (C2H6). This is because methanol can form stronger hydrogen bonds compared to ethane. Methanol contains both a hydrogen atom attached to oxygen (making it a hydrogen bond donor) and two lone pairs of electrons on oxygen (making it a hydrogen bond acceptor), allowing it to form hydrogen bonds with other methanol molecules. In contrast, ethane does not have hydrogen bonding capabilities.