Question

Based on its type of chemical bond, which substance has the highest boiling point?

Answer 1

Answer: Option (b) is the correct answer.

Explanation:

When a compound contains a strong bond between its combining atoms or molecules then the compound will have a high boiling point.

An ionic bond is a strong bond because it contains strong force of attraction between two oppositely charged atoms.  

For example, LiF is an ionic compound in which lithium is $Li^{+}$ ion and fluorine is $F^{-}$ ion.

Therefore, LiF compound will have strong force of attraction.

On the other hand, covalent compounds have weak bond due to sharing of electrons. Hence, they have low boiling point.

For example, $CO_{2}$, $CCl_{4}$, and $H_{2}$ etc are covalent compounds.

Thus, we can conclude that LiF substance has the highest boiling point.

Answer 2

Answer: Lithium Fluoride

Explanation: Let’s see,,,
1. Obviously not hydrogen or carbon dioxide because they’re gas at room temp.
2. Lithium Fluoride is an ionic compound which means they have higher intermolecular forces and require more energy to break them, so it probably has a higher boiling point.