Q47 / 180 · COMEDK 2023 (Memory Based) · Chemistry
The ion that is isoelectronic with $\mathrm{CO}$ is
- A$\mathrm{O}_2^{+}$
- Correct answerB$\mathrm{CN}^{-}$
- C$\mathrm{O}_2^{-}$
- D$\mathrm{N}_2^{+}$
Solution
$\mathrm{CN}^{-}$is isoelectronic to $\mathrm{CO}$ as they have same number of electrons.
Number of electrons in the given species is as follows,
$\begin{aligned}
& \mathrm{CO}=6+8=14 \\
& \mathrm{O}_2^{-}=16+1=17 \\
& \mathrm{~N}_2^{+}=14-1=13 \\
& \mathrm{O}_2^{+}=16-1=15 \\
& \mathrm{CN}^{-}=6+7+1=14
\end{aligned}$
Hence, the correct answer is option: 'B'.