In organic chemistry, what term describes a formula that shows the arrangement or location of atoms in a molecule?

In organic chemistry, what term describes a formula that shows the arrangement or location of atoms in a molecule?

• A. Molecular weight
• B. Empirical formula
• C. Structural formula
• D. Ball-and-stick model

Answer: (C)

The arrangement of atoms in a molecule is captured by the structural formula. It shows which atoms are connected to which and how the bonds link them, conveying the actual connectivity and layout of the molecule. This makes it possible to distinguish isomers that have the same elements and even the same molecular weight but different arrangements, which affects properties and reactivity. Molecular weight is simply the mass of the molecule, not how the atoms are connected. The empirical formula gives only the simplest whole-number ratio of elements in the compound, not the specific connectivity. A ball-and-stick model provides a three-dimensional physical representation of the molecule’s shape, but it is not a formula describing the arrangement.

The arrangement of atoms in a molecule is captured by the structural formula. It shows which atoms are connected to which and how the bonds link them, conveying the actual connectivity and layout of the molecule. This makes it possible to distinguish isomers that have the same elements and even the same molecular weight but different arrangements, which affects properties and reactivity.

Molecular weight is simply the mass of the molecule, not how the atoms are connected. The empirical formula gives only the simplest whole-number ratio of elements in the compound, not the specific connectivity. A ball-and-stick model provides a three-dimensional physical representation of the molecule’s shape, but it is not a formula describing the arrangement.