In the following reaction sequence, the correct structure of E, F and G are :

Among the following, the coloured compound is :

Both [Ni(CO)$$_4$$] and [Ni(CN)$$_4$$]$$^{2-}$$ are diamagnetic. They hybridisations of nickel in these complexes, respectively, are :

The IUPAC name of [Ni(NH$$_3$$)$$_4$$] [NiCl$$_4$$] is :