Which property of $\mathrm{carbon}$ allows it to form very large molecules, such as those found in organic compounds?

• A. $\mathrm{Carbon}$ atoms are always found as single isolated atoms and do not bond with each other.
• B. $\mathrm{Carbon}$ can form up to $4$ covalent bonds with other atoms, allowing for extensive chains and rings.
• C. $\mathrm{Carbon}$ can only form ionic bonds, which leads to the formation of large molecules.
• D. $\mathrm{Carbon}$ has the highest electronegativity among all elements, enabling it to attract many atoms.

Answer: (B)

Verified step by step guidance

1. Understand that the question asks about the unique property of carbon that enables it to form very large molecules, which are the basis of organic compounds.
2. Recall that carbon has four valence electrons, which means it can form up to four covalent bonds with other atoms, including other carbon atoms.
3. Recognize that this tetravalency allows carbon atoms to bond with each other in long chains, branched structures, and rings, creating a vast variety of complex molecules.
4. Note that carbon forms covalent bonds rather than ionic bonds, which is essential for the stability and diversity of organic molecules.
5. Conclude that the key property is carbon's ability to form four covalent bonds, enabling the construction of large and complex molecular structures.