The number of species from the following which are paramagnetic and with bond order equal to one is

Question

Canvas Classes · Accepted Answer

Step 1 — Find bond order and magnetic nature for each:

| Species | e⁻ | BO | Unpaired? |
|---------|----|----|----------|
|  | 2 | 1 | No (diamagnetic) |
|  | 3 | 0.5 | Yes (paramagnetic) |
|  | 15 | 2.5 | Yes (paramagnetic) |
|  | 16 | 2 | Yes (paramagnetic) |
|  | 18 | 1 | No (diamagnetic) |
|  | 18 | 1 | No (diamagnetic) |
|  | 19 | 0.5 | Yes (paramagnetic) |
|  | 10 | 1 | Yes (paramagnetic) |

Step 2 — Paramagnetic AND bond order = 1:
- : BO = 1, paramagnetic ✓
- : BO = 1 but diamagnetic ✗

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