Final answer:
Option D: The compound CH₃F contains polar covalent bonds due to the electronegativity difference between carbon and fluorine, where fluorine's higher electronegativity creates a partial negative charge.
Step-by-step explanation:
The question asks which of the following compounds contains polar covalent bonds: CS₂, LiF, F₂, or CH₃F. A polar covalent bond is a type of chemical bond where a pair of electrons is unequally shared between two atoms. The atom with the higher electronegativity will attract the shared electrons more strongly, creating a dipole with a partial positive charge on the less electronegative atom and a partial negative charge on the more electronegative atom.
To determine if a bond is polar, we consider the electronegativity difference between the bonded atoms. For compounds like CS₂ and F₂, the bonds are nonpolar because the electronegativity difference is negligible. LiF contains an ionic bond due to the significant difference in electronegativity between lithium and fluorine. However, CH₃F contains polar covalent bonds, particularly between the carbon and the fluorine atoms, because of the difference in electronegativity between carbon and fluorine, making fluorine more electronegative.