NEET 2022 — Chemistry solution

NEET2022Chemistry

Which amongst following is incorrect statement ?

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

Solution

O $_{2}^{+}$ has 15 electrons. Filling the molecular orbital diagram leaves one unpaired electron in the antibonding $π^{*}$ orbital.

A species with one unpaired electron is paramagnetic, not diamagnetic. Hence statement (3) is incorrect.

The other statements are accurate: C $_{2}$ indeed has four electrons in the degenerate bonding $π$ orbitals, H $_{2}^{+}$ has just one electron, and the bond orders listed for the O $_{2}$ family follow directly from MO theory.

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