Which one of the compound is not known? (A) \( \mathrm{NCl}_{5} \) (B) \( \mathrm{PCl}_{5} \) (C...

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Which one of the compound is not known?
(A) \( \mathrm{NCl}_{5} \)
(B) \( \mathrm{PCl}_{5} \)
(C) \( \mathrm{AsCl}_{5} \)
(D) \( \mathrm{NCl}_{3} \)
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