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Chemistry Question on Chemical bonding and molecular structure

Which of the following is paramagnetic with bond order 0.50.5 ?

A

F2{{F}_{2}}

B

H2+H_{2}^{+}

C

N2{{N}_{2}}

D

O2−O_{2}^{-}

Answer

H2+H_{2}^{+}

Explanation

Solution

H2+=σ1s1H_{2}^{+}=\sigma 1{{s}^{1}} (According to molecular orbital theory)
Bond order bonding electrons =−antibonding electrons2=\frac{-antibonding\text{ }electrons}{2}
=12=0.5=\frac{1}{2}=0.5 H2+H_{2}^{+}
is paramagnetic due to the presence of one unpaired electron.