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, c)
2. (b, c, d)
3. (a, c, d)
4. (a, b, d)