Question

why is carbon so important in the molecules of life?
○ it is the heaviest element
○ it is always charged
○ it can form four bonds and make chains and rings
○ it only forms single bonds

Explanation:

• Option 1: Carbon is not the heaviest element (e.g., elements like uranium are heavier), so this is incorrect.
• Option 2: Carbon is not always charged; it can form neutral compounds, so this is wrong.
• Option 3: Carbon has 4 valence electrons, allowing it to form four covalent bonds. It can form long chains (like in hydrocarbons) and rings (like in cyclic compounds), which is essential for the complex molecules of life (e.g., carbohydrates, proteins, nucleic acids, lipids). This is correct.
• Option 4: Carbon can form single, double, and triple bonds (e.g., in alkenes, alkynes), so this is incorrect.

Answer:

C. It can form four bonds and make chains and rings