Since carbon covalent compounds contain only a few atoms and the forces between molecules are weak , most covalent compounds have low melting points.However , some, like carbon compounds ,can be vary large . An example is the diamond in which carbon atoms each share four electrons to form giant lattices.
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Carbon compounds have low melting and melting boiling points because it is a covalent bond which have strong bond with their atoms or molecules ,having small intermolecular force .example -diamond,graphite,.etc