Which of the following molecules does not exist according to molecular orbital theory?

$A$ homonuclear diatomic gas molecule shows $2$-electron magnetic moment. The one-electron and two-electron reduced species obtained from the above gas molecule can act as both oxidizing and reducing agents. When the gas molecule is one-electron oxidized, the bond length decreases compared to the neutral molecule. The gas molecule is

Incorrect statement regarding $N(SiH_3)_3$ is

Which of the following molecules has the highest bond energy?

Fill in the blanks given below:
$(i)$ The Molecular Orbital Theory was proposed by .......... and .......... scientists.
$(ii)$ The addition of atomic orbitals results in the formation of ............ orbitals.
$(iii)$ The distribution of electrons in molecular orbitals is called .......... .
$(iv)$ The number of bonds between atoms joined by a covalent bond is called .......... .

Which one of the following pairs of species have the same bond order?