What is the correct sequence of bond order for the given species?

According to $MOT$,which of the following is correct?

Which of the following molecular orbitals has a nodal plane and is relatively higher in energy compared to bonding orbitals?

Select the incorrect statement about $N_2$ molecule.

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

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 .......... .