Compounds that have the same chemical formula but different structural formulas?

Compounds that have the same chemical formula but different structural formulas?

• A. Structural Formula
• B. Organic Compound
• C. Hydrocarbon
• D. Isomer

Answer: (D)

The concept being tested is that two compounds can share the same number and type of atoms but be arranged differently, making them a special class called isomers. When two substances have the same chemical formula yet different structural formulas, they are isomers. This difference in how atoms connect or are arranged in space leads to different properties, even though the formula looks the same. For example, two butane forms—one with a straight carbon chain and one with a branched chain—both have the formula C4H10, but their structures are different, so they behave as separate substances. Other terms don’t capture this idea. A structural formula is just a way to show how atoms are connected in a molecule, not the fact that two substances share the same formula. An organic compound is any carbon-containing compound, which is too broad. A hydrocarbon is a carbon-and-hydrogen compound, also a broad category, not the specific distinction about same-formula, different-structure.

The concept being tested is that two compounds can share the same number and type of atoms but be arranged differently, making them a special class called isomers. When two substances have the same chemical formula yet different structural formulas, they are isomers. This difference in how atoms connect or are arranged in space leads to different properties, even though the formula looks the same.

For example, two butane forms—one with a straight carbon chain and one with a branched chain—both have the formula C4H10, but their structures are different, so they behave as separate substances.

Other terms don’t capture this idea. A structural formula is just a way to show how atoms are connected in a molecule, not the fact that two substances share the same formula. An organic compound is any carbon-containing compound, which is too broad. A hydrocarbon is a carbon-and-hydrogen compound, also a broad category, not the specific distinction about same-formula, different-structure.