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# According to MO theory,which of the following statement is correct?

$\begin{array}{1 1}(a)\;O_2^+\text{ is paramagnetic and bond order greater than }O_2\\(b)\;O_2^+\text{ is diamagnetic and bond order less than }O_2 \\(c)\;O_2^+\text{ is paramagnetic and bond order less than }O_2\\(d)\;O_2^+\text{ is diamagnetic and bond order more than }O_2\end{array}$

According MO theory,
$O_1^+$ is paramagnetic and bond order greater than $O_2$
$O_2$ bond order is 2
$O_2^+$ bond order is 2.5
Hence (a) is the correct answer.