Covalent compounds have low melting points because

covalent molecules have definite shape

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covalent bond is weaker than ionic bond

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covalent bond is less exothermic

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covalent molecules are held by weak Van der Waals' force of attraction

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Solution

The correct option is D covalent molecules are held by weak Van der Waals' force of attraction
Ionic compounds have strong electrostatic forces of attraction between oppositely charged ions. Hence, they have high melting points.
On the other hand, covalent compounds contain weak Van der Waals forces of attraction. Hence, they have low melting points.

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