The tests performed on compound X and their inferences are :

	Test	Inference
(a)	2, 4 - DNP test	Coloured precipitate
(b)	Idoform test	Yellow precipitate
(c)	Azo-dye test	No dye formation

Compound 'X' is :

The increasing basicity order of the following compounds is :

The major product of the following reaction is :

The complex that has highest crystal field splitting energy ($$\Delta $$), is :