In the following reactions sequence, structure of A and B respectively will be :

For the following reactions


K_s and K_e, are respectively, the rate constants for substitution and elimination and $$\mu = {{{k_s}} \over {{k_e}}}$$ the correct options is

The number of possible optical isomers for the complexes MA₂B₂ with sp³ and dsp² hydridized metal atom. respectively, is :
Note : A and B are unidentate netural and unidentate monoanionic ligands, respectively.

The bond order and the magnetic characteristics of CN^- are :