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Chemistry
Constitutional isomers — Same formula, different connections
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Build C and O bond networks. Hydrogen counts follow valence. Compare working structure B with reference A to distinguish constitutional isomers from different drawings.
Drag to redraw. Choose Connect/Disconnect to change the structure.
Choose the first and second atoms.
B's structure
C₄H₁₀
butane
4 C10 H
Same constitution
The atoms have the same connections. A different drawing does not create another isomer.
Read B's connections
| Atom | Bonded to | H count |
|---|---|---|
| C1 (C) | C2 | 3 |
| C2 (C) | C1, C3 | 2 |
| C3 (C) | C2, C4 | 2 |
| C4 (C) | C3 | 3 |
1
Kept only for this visit. Duplicate structures do not create new cards.
butane
CH₃CH₂CH₂CH₃
Model notes
- These diagrams show which atoms are connected, not bond angles, lengths or 3D molecular shapes. Rotating and aligning drawings does not test stereoisomerism.
- This resource covers neutral, open-chain C₄H₁₀, C₅H₁₂ and C₃H₈O with single bonds. Hydrogen counts follow C(IV), O(II) and H(I) valences. Rings, ions, radicals, multiple bonds and conformations are excluded.
- Disconnected fragments represent a drawing being edited. Adding or removing bonds does not simulate a chemical reaction. The collection compares connections, ignores positions and numeric labels, and lasts only for this visit.