According to molecular orbital theory, which of the following is true with respect to ${Li}_{2}^{+}$ and ${Li}_{2}^{-}$ ?

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${Li}_{2}^{+} is stable and {Li}_{2}^{-} is unstable$

${Li}_{2}^{+} is unstable and {Li}_{2}^{-} is stable$

Both are stable

Both are unstable

answer is D.

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Detailed Solution

According to molecular orbital theory,
The stability of a molecule depends on how many electrons are in its bonding orbitals compared to its antibonding electrons. If there are more bonding electrons than antibonding electrons, the molecule is stable; if there are fewer, it is unstable.
Both ${Li}_{2}^{+}$ and ${Li}_{2}^{-}$ has 0.5 bond order and hence both are stable.

Hence, the correct option is (D)

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