Which of the following is isoelectronic?

Which of the following is isoelectronic?
  1. $\mathrm{CO}_2, \mathrm{NO}_2$
  2. $\mathrm{NO}_2^{-}, \mathrm{CO}_2$
  3. $\mathrm{CN}^{-}, \mathrm{CO}$
  4. $\mathrm{SO}_2, \mathrm{CO}_2$

Solution

In $\mathrm{CN}^{-}$the number of electrons $=6$ $+7+1=14$ In $\mathrm{CO}$ the number of electrons $=6+$ $8=14$

Asked in: NEET 2002

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