NEET Chemistry The p-Block Elements (XII) Questions Solved

Only iodine forms hepta-fluriode IF7, but chlorine and bromine give penta-flurides. 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 accommodate more number iof smaller fluorine atom around it 

(d) low chemical reactivity of IF7

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(c)     Due to larger size of iodine atom it can accommodate upto seven small 

         fluorine atoms around, it while due to smaller sizes of chlorine and

         bromine atoms do not accommodate seven fluorine atoms, i.e., steric

         factor dominate in case of chlorine and bromine. 

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