Covalent bonds are types of chemical bonds that result from the sharing of electrons between non-metal atoms.
Covalent bonds result in the formation of covalent compounds.
Covalent compounds are characterized by low melting and boiling points.
Therefore, it won't be true to say they have high melting and boiling points.
Other properties of covalent bonds include poor conductors of electricity and heat, gases or liquids at room temperature, and are non-polar compounds among others.