Asked in PMC Practice Test 10 (2021) 2021Moderate

A structural formula shows?

Correct answer: A. Arrangement of atoms in the compound

  • A. Arrangement of atoms in the compound
  • B. Arrangement of electrons in the compound
  • C. Arrangement of orbitals that are involved in bonding
  • D. Lewis structure of compounds

Explanation

Option A: Arrangement of atoms in the compound: This option refers to the structural formula's main purpose, which is to depict the arrangement of atoms within a compound. It shows the connectivity between atoms, indicating how they are bonded and the overall molecular structure. Option B: Arrangement of electrons in the compound: This option refers to the electron distribution within a compound. While the structural formula indirectly provides information about the electron distribution by showing the connectivity of atoms, it does not explicitly illustrate the precise arrangement of electrons. Option C: Arrangement of orbitals that are involved in bonding: This option refers to the specific arrangement of atomic orbitals participating in the bonding process. While structural formulas can provide insights into the types of bonds present (single, double, or triple bonds), they do not typically illustrate the arrangement of orbitals involved in bonding. Option D: Lewis structure of compounds: Lewis structures are a specific type of structural formula that uses dots and lines to represent electrons and bonds, respectively. While Lewis structures are one way to represent the arrangement of atoms in a compound, they are not the only type of structural formula, and other representations may be used depending on the complexity of the compound.

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About Classification of Organic Compounds

Organic compounds are classified by carbon skeleton into open-chain, branched-chain and cyclic compounds, including homocyclic and heterocyclic types. The classification also uses functional groups to distinguish hydrocarbons, halo compounds, alcohols, aldehydes, ketones, carboxylic acids and their derivatives, which is different from naming compounds by IUPAC rules.

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