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99 Percentile Qs Bank for JEE MainChemistryp Block Elements (Group 15, 16, 17 & 18)

Only Iodine forms Hepta-fluoride IF 7 , but Chlorine and Bromine give Penta-fluorides. The reason for this is :

Options

  1. ALow electron affinity of Iodine
  2. BUnusual pentagonal bipyramidal structure of IF 7
  3. CThat the larger Iodine atom can accommodate more number of smaller Fluorine atom around it
  4. DLow chemical reactivity of IF 7

Correct answer

C. That the larger Iodine atom can accommodate more number of smaller Fluorine atom around it

Step-by-step solution

Due to larger size of iodine atom, it can accommodate upto seven small fluorine atoms around, while due to smaller sizes of chlorine and bromine atoms cannot accommodate seven fluorine atoms, i.e., steric factor dominate in case of chlorine and bromine.

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