Only iodine forms heptafluoride IF₇, but chlorine and bromine give pentafluorides. The reason for this is

• A

  low electron affinity of iodine

• B

  unusual pentagonal bipyramidal structure of IF₇

• C

  that the larger iodine atom can accomodate more number of smaller fluorine atom around it

• D

      low chemical reactivity of IF₇