Which of the following statements are correct?
| a. | Among halogens, the radius ratio between iodine and fluorine is maximum. |
| b. | Leaving F — F bond, all halogens have weaker X — X bond than X — X' bond in interhalogens. |
| c. | Among interhalogen compounds a maximum number of atoms are present in iodine fluoride. |
| d. | Interhalogen compounds are more reactive than halogen compounds. |
1. a, b, and c
2. b, c, and d
3. a, c, and d
4. a, b, and d
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