Only iodine forms heptafluoride IF7, but chlorine and bromine give pentafluorides. The reason for this is
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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
answer is C.
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Detailed Solution
Only iodine forms heptafluoride IF7, but chlorine and bromine give pentafluorides. The reason for that the larger iodine atom can accomodate more number of smaller fluorine atom around it