Questions: Which drawing is a structural model of C3H8?

Which drawing is a structural model of C3H8?
Transcript text: Which drawing is a structural model of $\mathrm{C}_{3} \mathrm{H}_{8}$ ?
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Solution

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Solution Steps

Step 1: Analyze the chemical formula

The chemical formula C3H8 indicates a propane molecule. Propane has three carbon atoms and eight hydrogen atoms.

Step 2: Evaluate the options
  • A: This is a space-filling model of cyclopropane (C3H6), not propane.
  • B: This is a ball-and-stick model of propane (C3H8). This shows the spatial arrangement of atoms and bonds.
  • C: This is the expanded structural formula of propane (C3H8). This clearly shows all the atoms and bonds.
  • D: This represents only the carbon backbone and does not include the hydrogen atoms, thus it is incomplete.

Final Answer

B and C are structural models of C3H8. The question asks for _a_ structural model, indicating a single answer. Since answer C is the typical example of a simple structural formula/model, it is the better answer than B which is a ball-and-stick visual representation. So the best answer is C.

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