NEET 2022 · ChemistryMO theoryPrevious Year Question

Which amongst the following is an incorrect statement?

Answer: (D) $O X_{2} X^{+}$ ion is diamagnetic.. \textbf{Answer:} (D) $O X_{2} X^{+}$ ion is diamagnetic.

A.The bond orders of $O X_{2} X^{+}$ , $O X_{2}$ , $O X_{2} X^{-}$ and $O X_{2} X^{2 -}$ are $2.5$ , $2$ , $1.5$ and $1$ , respectively.
B. $C X_{2}$ molecule has four electrons in its two degenerate $π$ molecular orbitals.
C. $H X_{2} X^{+}$ ion has one electron.
D. $O X_{2} X^{+}$ ion is diamagnetic.✓

Correct Answer

(D) $O X_{2} X^{+}$ ion is diamagnetic.

Solution & Explanation

\textbf{Answer:} (D) $O X_{2} X^{+}$ ion is diamagnetic. \textbf{Solution:} By MOT, $O X_{2} X^{+}$ has configuration $\dots (π^{*} 2 p)^{1}$ , i.e. one unpaired electron, so it is paramagnetic, not diamagnetic. The other statements (bond-order series, $C X_{2}$ double bond as two $π$ MOs, single-electron $H X_{2} X^{+}$ ) are all correct.

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