Which of the following species are isoelectronic?
$I. CH_3^+$
$II. NH_2^-$
$III. NH_4^+$
$IV. NH_3$

  • A
    $I, III, IV$
  • B
    $II, III, IV$
  • C
    $I, II, IV$
  • D
    $II$ and $I$

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