Which class includes oxides of carbon, carbonates, cyanides, and carbides (no C-C bonds or C-H bonds)?

• A. Inorganic
• B. Organic
• C. Buffer region
• D. Titration

Answer: (A)

The main idea is how carbon-containing compounds are classified: organic chemistry centers on carbon-hydrogen (and usually carbon–carbon) bonding, while inorganic chemistry covers carbon compounds that don’t rely on C–H or C–C bonds.

Oxides of carbon, carbonates, cyanides, and carbides fit here because their structures are built from carbon bonded to elements other than hydrogen (for example, carbon-oxygen, carbon-nitrogen, or carbon-metal bonds) rather than a carbon backbone with C–H or C–C bonds. That places them in the inorganic category.

The other options aren’t about classes of compounds. A buffer region is a concept in acid-base chemistry, and titration is a method for determining concentration. So they don’t describe the type of compound involved.