$I C l_{3}$ can form but $B r C l_{3}$ cannot form, because

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Bromine is electronegative to react with chlorine

Bromine is not electronegative enough to react with chlorine

Iodine can have positive oxidation state but bromine cannot

Iodine is large enough to accommodate 3 chlorine atoms around itself

answer is A.

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Detailed Solution

Since iodine atom is large enough it can accommodate 3 chlorine atoms to form $I C l_{3}$ but being small, there will be steric hindrance when $3 C l$ atoms surround $B l_{2}$ atoms.

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