Question
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Polar covalent compounds conduct electricity in their:
A.Fused form
B.Molten form
C.Amorphous form
D.Crystalline form

Answer
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Hint:When two atoms are joined by one pair of electrons are said to be joined by a single covalent bond. Depending upon the number of electrons shared by each atom in bond formation, a single, double or triple bond is formed. Number of electrons shared is known as covalency. Polar compounds conduct electricity when dissolved in polar solvents.

Complete answer:
Covalent solids are those in which atoms are linked together by covalent bonds and forms infinite three dimensional giant structure, for example Diamond, graphite, silica, etc. on the other hand, molecular solid are molecules formed by covalent bond and then the molecules associated due to intermolecular force of attraction or vander waal force we can say. Examples of molecular solid are solid iodine and dry ice or solid carbon dioxide.
The compounds having polar bonds are known as polar compounds. These polar compounds do not conduct electricity in their pure form but give conducting solutions when these polar compounds are dissolved in polar solvents like water is a polar solvent or we can say molten state of polar compounds. This is due to the availability of free electrons or ions in their molten state. Thus, polar covalent compounds conduct electricity in their molten form. Most covalent compounds are bad conductors of electricity but few polar covalent compounds due to self ionization can conduct electricity, for example water, liquid ammonia, etc.

Thus, the correct option is B.

Note:
Non polar compounds are soluble in non polar solvents, non polar compounds form a vander waal bond with non polar solvent molecules. Benzene and \[{\text{CC}}{{\text{l}}_4}\] are some non polar solvents. Covalent bonds are rigid and directional but ionic bonds are non directional.