Is it true that Of the four landscape regions in Europe central upland contain majority of realm productive coal field?

No, it is not true. The correct answer is North European Plain.

The North European Plain contains the majority of the realm's productive coalfields, including those in the Ruhr, Silesia, and Donbas regions. The Central Uplands region contains some coalfields, but they are not as extensive or productive as those in the North European Plain.