A) \[C{{l}_{2}}\]and\[B{{r}_{2}}\]are evolved
B) \[C{{l}_{2}}\]is evolved
C) \[C{{l}_{2}},B{{r}_{2}}\] and\[{{F}_{2}}\]are evolved
D) none of the above
Correct Answer: D
Solution :
Upper halogen can replace lower halogen from their compounds solution.
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