Final answer:
The most covalent bond in the set is C-O. Carbon and oxygen have an electronegativity difference of 0.89, indicating a slightly polar covalent bond. C=O has a higher electronegativity difference of 1.89, making it a more polar bond.
Step-by-step explanation:
Covalent bonds occur between nonmetal atoms, where they share electrons to form a bond. The strength of a covalent bond depends on the electronegativity difference between the elements involved. A larger electronegativity difference corresponds to a more polar bond, indicating greater ionic character. The most covalent bond from each set can be determined by comparing the electronegativity difference of the atoms.
d) The most covalent bond in this set is C-O. Carbon (C) has an electronegativity of 2.55, while oxygen (O) has an electronegativity of 3.44. The electronegativity difference is 0.89, indicating a slightly polar covalent bond. In the other set, C=O, the electronegativity difference is higher at 1.89, indicating a more polar bond. Therefore, the C-O bond is more covalent compared to the C=O bond.