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- Aromatic, Cyclic Compounds and DNA–RNA Bases: Complete Ring-Based Table Notes for UPSC/BPSC
| Compound | Ring Type | Key Group | Exam Point |
|---|
| Benzene | 6-membered ring | — | 6 π electrons (aromatic) |
| Toluene | Benzene ring | –CH₃ | Alkyl substituted |
| Phenol | Benzene ring | –OH | Weak acid |
| Aniline | Benzene ring | –NH₂ | Basic |
| Nitrobenzene | Benzene ring | –NO₂ | Electron withdrawing |
| Compound | Ring Structure | Exam Point |
|---|
| Naphthalene | 2 fused rings | Simplest fused aromatic |
| Anthracene | 3 linear rings | Linear fusion |
| Phenanthrene | 3 angular rings | Angular fusion |
| Compound | Ring Shape | Exam Point |
|---|
| Cyclopropane | Triangle | High strain |
| Cyclobutane | Square | Less stable |
| Cyclopentane | Pentagon | Stable |
| Cyclohexane | Hexagon (chair) | Most stable |
| Compound | Heteroatom | Ring Feature |
|---|
| Pyridine | N | Basic aromatic |
| Pyrrole | N | Weakly basic |
| Furan | O | Oxygen ring |
| Thiophene | S | Sulfur ring |
| Imidazole | 2N | Biological relevance |
| Indole | N + fused ring | Amino acid structure |
| Base | Ring Type | Feature |
|---|
| Adenine | Double ring | Purine |
| Guanine | Double ring | Purine |
| Base | Ring Type | Found In |
|---|
| Cytosine | Single ring | DNA & RNA |
| Thymine | Single ring | DNA only |
| Uracil | Single ring | RNA only |
