B) Because there are more covalent bonds present, more energy is required to break them.
Why does methane have a lower boiling point than propane?
What can you deduce about the intermolecular forces between the molecules illustrated above based on their general size and nonpolarity? Calculate the melting and boiling temperatures of these alkanes in comparison to each other and to a more polar molecule like water.
The alkanes displayed have a net dipole of almost zero and are tiny molecules. As a result, London forces are the only intermolecular forces involved. Because propane molecules are larger than those of ethane and methane, there will be more London attraction forces holding them together, resulting in higher melting and boiling temperatures. However, the forces are still mild, therefore these alkanes should have lower melting and boiling temperatures than a polar molecule like water.
Why does ethane have a lower boiling point than butane?
The intermolecular interactions between the molecules of butane are stronger than those of ethane since it is a bigger molecule. These intermolecular forces must be resisted in order for a compound to boil. Stronger intermolecular interactions require more energy to resist, hence the boiling point rises as the intermolecular forces become stronger. Butane will have a greater boiling point than ethane as a result of this. A more advanced response is: Instantaneous and induced dipole interactions create intermolecular forces in non-polar molecules like these. Because the butane molecule is larger, it has a larger electron cloud that can get polarized, resulting in a larger immediate or induced dipole, which creates stronger intermolecular interactions and hence raises the boiling point.
Why does methane have a boiling point of?
Because of the weak intermolecular interactions between alkane molecules, they have low melting and boiling points. At room temperature, methane, ethane, propane, and butane are all gases. As a result, breaking these forces requires more energy, resulting in higher melting or boiling temperatures.
Why does butane have a higher boiling point than propane?
The intermolecular interactions between molecules in simple molecular compounds like hydrocrabons are broken down when they are cooked. To break down these forces, heat energy is necessary. Butane is larger than propane, therefore larger molecules have stronger intermolecular interactions between them. More energy is required to break down intermolecular bonds when there are more intermolecular interactions between molecules, resulting in higher boiling temperatures for bigger chained hydrocarbons (butane in this case).
Why does methane have a higher boiling point than ethane?
Because the van der Waals forces of attraction in ethane molecules are greater than those in methane molecules (CH4), the boiling point of ethane is higher than that of methane.