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4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
The species having bond order different from that in $\mathrm{CO}$ is
  • ✓
    $\mathrm{NO}^{-}$
  • B
    $\mathrm{NO}^{+}$
  • C
    $\mathrm{CN}^{-}$
  • D
    $\mathrm{N}_2$
✓

Answer

Correct option: A.
$\mathrm{NO}^{-}$
a
$\mathrm{NO}^{-}$($16$ electron system)

Bond order $=2$.

$\mathrm{NO}^{\oplus}, \mathrm{CN}^{-}$and $\mathrm{N}_2$ are isoelectronic with $\mathrm{CO}$ therefore all have same bond order $(=3)$

Hence ($A$) is correct.

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