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Specify the coordination geometry around and hybridisation of \( \mathrm{N} \) and \( \mathrm{B} \) atoms in a \( 1: 1 \) complex of \( \mathrm{BF}_{3} \) and \( \mathrm{NH}_{3}- \)
\( \mathrm{P} \)
(A) N: tetrahedral \( \mathrm{sp}^{3} ; \mathrm{B}: \) tetrahedral \( \mathrm{sp}^{3} \)
W
(B) \( \mathrm{N} \) : pyramidal \( \mathrm{sp}^{3} \); \( \mathrm{B}: \) pyramidal \( \mathrm{sp}^{3} \)
(C) \( \mathrm{N} \) : pyramidal \( \mathrm{sp}^{3} ; \mathrm{B} \) : planar \( \mathrm{sp}^{2} \)
(D) \( \mathrm{N}: \) pyramidal \( \mathrm{sp}^{3} ; \mathrm{B}: \) tetrahedral \( \mathrm{sp}^{3} \mathrm{~d} \)
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