Which of the following compounds is not considered organic?

• A. $C_6{H}_6$ (benzene)
• B. ${\mathrm{CO}}_2$ (carbon dioxide)
• C. ${\mathrm{CH}}_4$ (methane)
• D. $C_2{H}_6$ (ethane)

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the definition of organic compounds. Organic chemistry primarily deals with compounds containing carbon atoms bonded to hydrogen atoms, often including other elements like oxygen, nitrogen, sulfur, etc., but the key feature is carbon-hydrogen (C-H) bonds.
2. Step 2: Examine each compound to see if it contains carbon-hydrogen bonds. For example, benzene (\(C_6H_6\)), methane (\(CH_4\)), and ethane (\(C_2H_6\)) all have carbon atoms bonded directly to hydrogen atoms.
3. Step 3: Look at carbon dioxide (\(CO_2\)). It contains carbon and oxygen atoms but does not have any carbon-hydrogen bonds. Instead, it has double bonds between carbon and oxygen atoms.
4. Step 4: Based on the presence or absence of carbon-hydrogen bonds, determine which compound does not fit the typical criteria for organic compounds.
5. Step 5: Conclude that carbon dioxide (\(CO_2\)) is not considered an organic compound because it lacks carbon-hydrogen bonds, unlike the other listed compounds.