Carbon compounds : (i) are good conductors of electricity. (ii) are bad conductors of electricity. (iii) have strong forces of attraction between their molecules. (iv) have weak forces of attraction between their molecules. The correct statements are :

According to the NCERT textbook:

1. Electrical Conductivity: Most carbon compounds are poor conductors of electricity because the bonding in these compounds is covalent and does not give rise to any free ions. Thus, statement (ii) is correct, and statement (i) is incorrect.
2. Intermolecular Forces: Carbon compounds have low melting and boiling points (for example, methane $CH_4$ has a melting point of $90\text{ K}$ and boiling point of $111\text{ K}$). This indicates that the forces of attraction between the molecules (intermolecular forces) are not very strong. Thus, statement (iv) is correct, and statement (iii) is incorrect.

Therefore, statements (ii) and (iv) are correct, making option c the right choice.