Question

Which of the following is most polar covalent bond?

A. a bond between carbon and hydrogen
B. a bond between carbon and oxygen
C. a bond between carbon atoms

Answer 1

The most polar covalent bond among the options is the bond between carbon and oxygen, as oxygen is significantly more electronegative than carbon, leading to a greater difference in electron sharing.

Explanation:

Polarity of Covalent Bonds

To determine which of the following is the most polar covalent bond, we must consider the electronegativity difference between the atoms involved in each bond:

A. Carbon and hydrogen form a bond that could be considered slightly polar covalent because carbon is slightly more electronegative than hydrogen, but the difference is not very large.

B. Carbon and oxygen form a definitely polar covalent bond as oxygen is significantly more electronegative than carbon, leading to a greater electron-sharing inequality.

C. Between two carbon atoms, the bond is nonpolar covalent because they have the same electronegativity.

Given this information, the bond between carbon and oxygen (B) is the most polar because of the significant electronegativity difference between the two atoms. This causes the electrons to be more attracted to the oxygen atom, giving it a partial negative charge, while the carbon atom has a partial positive charge.

Answer 2

A. a bond between carbon and oxygen

Step-by-step explanation:

Please refer to attached section of periodic table to get an insight of the electronegativity values of the Hydrogen, carbon and oxygen atoms.

The bond polarity refers to the electronegativity difference between any two atoms joined through covalent linkage.

As per pauling's scale, Oxygen has a value of electronegativity as 3.44. To get a polar covalent bond between any two atoms, the electronegativity (E.N) difference should be less than 1.7 - 1.8 and more than 0.5.

Let's look at the E.N difference between mentioned bonds:

C-H bond: 2.55 - 2.20 = 0.35

C-O bond:2.55 -3.44= 0.89

C-C bond:2.55 -2.55 = 0

Therefore, the bond between Carbon and Oxygen would be most polar among all.

Hope it helps!