Which one of the following does not exist in the free form? (A) \( ...

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Which one of the following does not exist in the free form?
(A) \( \mathrm{BF}_{3} \)
(B) \( \mathrm{BCl}_{3} \)
(C) \( \mathrm{BBr}_{3} \)
(D) \( \mathrm{BH}_{3} \)
\( \mathrm{P} \)
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