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Question
Give reasons When Cl2 reacts with the excess of F2, ClF3 is formed and not FCl3.
Solution
Fluorine does not possess d orbitals, so it cannot expand its octet to bond with three chlorine atoms and form FCl3. Chlorine, on the other hand, has empty d orbitals and thus, it can expand its octet to bond with three fluorine atoms and form ClF3.
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