According to molecular orbital theory,the species among the following that does not exist is

In which of the following ionization processes has the bond energy increased and the magnetic behaviour changed from paramagnetic to diamagnetic?

The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals:
$A$. have the same energy
$B$. have the minimum overlap
$C$. have same symmetry about the molecular axis
$D$. have different symmetry about the molecular axis
Choose the most appropriate from the options given below:

The compound $(SiH_3)_3N$ is expected to be

Arrange the following in the increasing order of their bond order: $O_{2}, O_{2}^{+}, O_{2}^{-}, O_{2}^{2-}$

Consider the following statements.
$I$. In the conversion of $O_2$ to $O_2^{2+}$,bond order decreases.
$II$. In the conversion of $O_2$ to $O_2^{2+}$,magnetic property is not changed.
$III$. In the conversion of $O_2$ to $O_2^{2+}$,bond length decreases.
$IV$. $O_2^{2-}$ and $B_2$ have same bond order.
Identify the correct statements.