Question

Which of the following statements is incorrect?

• A. Among $O_2^{+},O_2$ and $O_2^{-}$ the stability decreases as $O_2^{+}>O_2>O_2^{-}$
• B. $H{e}_2$ molecule does not exist as the effect of bonding and anti-bonding orbitals cancel each other.
• C. $C_2,O_2^{2-}$ and $L{i}_2$ are diamagnetic
• D. In $F_2$ molecule, the energy of ${\sigma }_{2p_z}$ is more than ${\pi }_{2p_x}$ and ${\pi }_{2p_y}$

Answer 1

The correct option is D In $F_2$ molecule, the energy of ${\sigma }_{2p_z}$ is more than ${\pi }_{2p_x}$ and ${\pi }_{2p_y}$

(A) Stability $O_2^{+}>O_2>O_2^{-}$
Bond order $2.521.5$
(C) In all these molecules all electrons are paired in molecular orbitals.