A) \[{{\operatorname{HBF}}_{4}}/\Delta \]
B) \[{{\operatorname{HBF}}_{4}}/\operatorname{N}a\operatorname{N}{{\operatorname{O}}_{2}},\operatorname{Cu},\Delta \]
C) \[\operatorname{Cu}\operatorname{F}/\operatorname{H}\operatorname{F}\]
D) \[\operatorname{Cu}/\operatorname{H}\operatorname{F}\]
Correct Answer: A
Solution :
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