The best answer for Isostructural species is those which have the same shape and hybridization.
(b) NF3 is pyramidal whereas BF3 is planar triangular.
BF–4 and NH+4 ions both are tetrahedral.
BC13 is triangular planar whereas BrCl3 is pyramidal.
NH3 is pyramidal whereas N03 is triangular planar.
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