Which property is typical of a covalent compound? a.  they are extremely hard solids. b.  they have low melting and boiling points. c.  they conduct electricity. d.  they have rigid crystal structures. e.  they exist only as gases and liquids.

 Option (B) is the correct answer.

Explanation:

A covalent compound is a compound whose atoms are bonded together by sharing of electrons.  

Also it is known that in covalent compounds weak inter molecular forces of attraction exists. Due to which it is easy to break the bond between atoms.

Hence, covalent compounds have low melting and boiling point .

Other properties of covalent compounds are as follows.

Thus, we can conclude that out of the given options property that is typical of a covalent compound is that they have low melting and boiling points.