Question

multiple choice
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carbon often combines with oxygen, hydrogen, and nitrogen to form organic molecules. what is the most likely reason that carbon can form many different types of molecules?
a carbon only forms ring structures.
b carbon can form four covalent bonds.
c carbon forms small, simple polymers.
d carbon can form only polar bonds.
attempt 1 of 2

Explanation:

• Option A: Carbon can form chain, ring, and branched structures, not only ring structures, so A is incorrect.
• Option B: Carbon has 4 valence electrons, allowing it to form four covalent bonds with other atoms (like C, H, O, N), which enables the formation of diverse molecular structures (e.g., long chains, rings, complex polymers), making this the correct reason.
• Option C: Carbon can form large, complex polymers (e.g., proteins, nucleic acids, polymers) and simple molecules, so "small, simple polymers" is incorrect.
• Option D: Carbon can form non - polar bonds (e.g., C - C, C - H bonds) as well as polar bonds, so D is incorrect.

Answer:

B. Carbon can form four covalent bonds.