Among the following,the pair in which the two species are not isostructural is

  • A
    $BH_4^-$ and $NH_4^+$
  • B
    $PF_6^-$ and $SF_6$
  • C
    $SiF_4$ and $SF_4$
  • D
    $IO_3^-$ and $XeO_3$

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