Isobutane (2-Methylpropane) overview
The stored Lewis connectivity is (CH₃)₃CH. The branched carbon skeleton distinguishes isobutane from n-butane even though both have formula C₄H₁₀.
How to draw i-C₄H₁₀
- Count 26 valence electrons. Include charge adjustments before drawing.
- Use the reviewed connectivity (CH₃)₃CH. Do not infer a different isomer from the formula alone.
- Place the required single, double or multiple bonds. Keep a running electron total.
- Complete terminal valence shells and add lone pairs or formal charges. The branched carbon skeleton distinguishes isobutane from n-butane even though both have formula C₄H₁₀.
- Verify the total electron count and geometry. The reviewed geometry is Tetrahedral at each carbon.
Why this example matters
The branched carbon skeleton distinguishes isobutane from n-butane even though both have formula C₄H₁₀.
Scope and model limits
The separate record prevents the name isobutane from resolving to the n-butane connectivity.
Common mistakes
- Using the straight-chain skeleton
- Adding a C=C bond
- Treating constitutional isomers as resonance forms
Related reviewed guides
Last reviewed: 2026-07-16. Educational reference only; verify graded work with course materials.