Question

Which of the following is correct regarding the melting points of ionic, polar covalent and non-polar covalent compounds?

• A. Polar covalent > ionic > non-polar covalent<
• B. lonic > polar covalent > non-polar covalent
• C. lonic > non-polar covalent > polar covalent
• D. All have same melting point

Answer 1

The Correct Option is B

The melting points of compounds generally follow this order:

Ionic compounds typically have the highest melting points due to the strong electrostatic forces between the oppositely charged ions.

Polar covalent compounds have intermediate melting points, as the molecules are attracted by dipole-dipole interactions, which are weaker than ionic bonds.

Non-polar covalent compounds usually have the lowest melting points because the forces between their molecules are relatively weak (London dispersion forces). Thus, the correct order is: \[ \text{Ionic} > \text{Polar covalent} > \text{Non-polar covalent} \]

The correct option is (B): lonic > polar covalent > non-polar covalent