In the classification of matter, which element is present in all organic molecules?

• A. Nitrogen
• B. Carbon
• C. Oxygen
• D. Sulfur

Answer: (B)

Verified step by step guidance

1. Understand that organic molecules are primarily composed of carbon atoms bonded to other elements.
2. Recall that the defining characteristic of organic chemistry is the study of carbon-containing compounds.
3. Recognize that while elements like nitrogen, oxygen, and sulfur can be present in organic molecules, they are not found in all of them.
4. Identify carbon as the element that is universally present in all organic molecules due to its ability to form four stable covalent bonds.
5. Conclude that carbon is the key element in the classification of matter for organic compounds.