Identify the correct order of reactivity for the following pairs towards the respective mechanism

Choose the correct answer from the options given below:

The pair from the following pairs having both compounds with net non-zero dipole moment is

In potassium ferrocyanide, there are ________ pairs of electrons in the $$t_{2g}$$ set of orbitals.

The number of bent-shaped molecule/s from the following is __________

N$$_3^-$$, NO$$_2^-$$, I$$_3^-$$, O$$_3$$, SO$$_2$$