The number of paramagnetic species among the following is

Question

Canvas Classes · Accepted Answer

Paramagnetic = has unpaired electrons.

Step 1 — MO analysis:

| Species | e⁻ | Unpaired e⁻ | Paramagnetic? |
|---------|-----|------------|---------------|
|  | 10 | 2 (in degenerate π) | Yes ✓ |
|  | 6 | 0 | No |
|  | 12 | 0 (all π filled) | No |
|  | 13 | 1 | Yes ✓ |
|  | 18 | 0 | No |
|  | 15 | 1 | Yes ✓ |
|  | 3 | 1 | Yes ✓ |

Step 2:  → 4 paramagnetic species

Answer: 4

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