The total number of species from the following in which one unpaired electron is present, is

Question

Canvas Classes · Accepted Answer

Step 1 — MO configurations and unpaired electrons:

| Species | Total e⁻ | Unpaired e⁻ |
|---------|----------|-------------|
|  | 14 | 0 (all paired) |
|  | 16 | 2 (two in π) |
|  | 13 | 1 ✓ |
|  | 17 | 1 ✓ |
|  | 18 | 0 |
|  | 1 | 1 ✓ |
|  | 14 | 0 (isoelectronic with N₂) |
|  | 3 | 1 ✓ |

Step 2: , , ,  each have 1 unpaired electron → 4 species

Note: JEE answer for this question is 3 (excluding  as it is considered not to exist stably).

Answer: 3

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