Q21 / 105 · JEE Main 2008 · Chemistry

Which one of the following constitutes a group of the isoelectronic species?

  • A
    $\mathrm{C}_2^{2-}, \mathrm{O}_2^{-}, \mathrm{CO}, \mathrm{NO}$
  • Correct answer
    B
    $\mathrm{NO}^{+}, \mathrm{C}_2^{2-}, \mathrm{CN}^{-}, \mathrm{N}_2$
  • C
    $\mathrm{CN}^{-}, \mathrm{N}_2, \mathrm{O}_2^{2-}, \mathrm{C}_2^{2-}$
  • D
    $\mathrm{N}_2, \mathrm{O}_2^{-}, \mathrm{NO}^{+}, \mathrm{CO}$

Solution

$\mathrm{NO}^{+}, \mathrm{C}_2^{2-}, \mathrm{CN}^{-}$and $\mathrm{N}_2$ all have fourteen electrons.

Hence, the correct answer is option: 'B'.

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