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JEE Main levelSingle correct optionDifficulty 2 of 3ph067

Assertion (A): is known but and are not. Reason (R): The iodine atom is large enough to accommodate seven fluorine atoms around it.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BA is false but R is true
  3. CBoth A and R are true but R is not the correct explanation of A
  4. DA is true but R is false

Answer: A

For an compound the ratio of radii of X and X' limits n. Iodine is the largest halogen, so seven small F atoms can be packed around it, while Cl and Br are too small. Hence A and R are true and R explains A.
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