Question

Which element is always present in organic compounds?

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

Hint:

Carbon is called the backbone element of organic chemistry because of its remarkable catenation property—the ability to form long chains and rings.

Answer 1

The Correct Option is B

Concept: Organic chemistry is the branch of chemistry that deals with compounds containing carbon. The unique ability of carbon atoms to form strong covalent bonds with themselves and with other elements leads to the formation of millions of compounds.

Step 1: Understand the definition of organic compounds. An organic compound must contain carbon as its fundamental constituent. Examples: \[ CH_4 \quad (\text{Methane}) \] \[ C_2H_5OH \quad (\text{Ethanol}) \] \[ CH_3COOH \quad (\text{Acetic Acid}) \] All contain carbon.

Step 2: Analyze the options. Hydrogen is present in most organic compounds but not all. Oxygen and nitrogen are present only in certain classes of compounds. Carbon is the only element common to all organic compounds.

Step 3: Conclude the answer. Therefore, carbon is always present in organic compounds.