Which of the following is true of carbon

Which of the following is true of carbon?
A. It forms only polar molecules. B. It can form a maximum of three covalent bonds with other elements. C. It is highly electronegative. D. It can form both polar and nonpolar bonds.

The Correct Answer and Explanation is :

The correct answer is D. It can form both polar and nonpolar bonds.

Explanation:

Carbon is a versatile element crucial to life and organic chemistry, primarily due to its unique bonding properties. It has four valence electrons in its outer shell, allowing it to form up to four covalent bonds with other atoms. This tetravalency is key to carbon’s ability to create diverse organic compounds.

1. Polar and Nonpolar Bonds: Carbon can form both polar and nonpolar bonds depending on the other elements it bonds with. When carbon bonds with elements of similar electronegativity, such as other carbon atoms or hydrogen, the resulting bonds are generally nonpolar. For example, in hydrocarbons like methane (CH₄), the carbon-hydrogen bonds are considered nonpolar due to the small difference in electronegativity between carbon and hydrogen. Conversely, when carbon bonds with more electronegative elements like oxygen or nitrogen, the bonds can become polar. In carbon dioxide (CO₂), for example, the bonds between carbon and oxygen are polar, creating a molecule with distinct partial charges.
2. Electronegativity: Carbon is not highly electronegative; its electronegativity is around 2.5 on the Pauling scale, which is less than elements like oxygen (3.5) or nitrogen (3.0). This moderate electronegativity allows carbon to engage in various bonding scenarios.
3. Covalent Bonds: While carbon can form four covalent bonds, it does not have a maximum of three. This allows for complex structures, including chains and rings, essential for the complexity of organic molecules.

In summary, the ability of carbon to form both polar and nonpolar bonds underlies its central role in biological systems and synthetic chemistry, enabling the formation of a vast array of compounds critical for life.