Which of the following is not a property of covalent compounds?

They have low melting points.

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They are not electrical conductors.

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They exhibit space isomerism.

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They undergo chemical reactions quickly.

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Solution

The correct option is D They undergo chemical reactions quickly.
Covalent compounds have low melting points. are non-conductors of electricity, they exhibit space isomerism because covalent bonds are directional. Covalent compounds reactions are slow because the breaking of bonds is non-spontaneous.
Hence, option D is correct.

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