Layered 2D organic-inorganic hybrid perovskite (OIHS) of the diammonium series, 1,5 di-aminepentane tetrachloro mangenate ([NH3-(CH2)(5)-NH3] MnCl4) was prepared by slow evaporation and reducing temperature method and characterized by single crystal X-ray diffraction analysis. Its structure consists of organic cation, [NH3(CH2)(5)NH3](+2) extended in a zigzag fashion and inorganic anion, [MnCl6](-2) where Mn2+ is coordinated by six Cl- ion in octahedral fashion. The organic and inorganic segments are alternately stacked along c-axis where inorganic layer is extended through corner-shared octahedra sandwiched by the di-aminopentane molecules. The layers (organic and inorganic) were connected to each other through N-H center dot center dot center dot Cl hydrogen bonds and van-der Waals interaction to build cation-anion-cation cohesion. The hybrid crystal had orthorhombic non-centrosymetric system having I2(1)2(1)2(1) space group with unit cell parameters a = 7.1742(3) , b = 7.3817(3) , c = 23.9650(10) , V = 1269.13 (3) and Z = 4. The hybrid exhibited excellent catalytic activity towards sulphide and alkene oxidation using aqueous H2O2 as an oxidant. OIHS of the diammonium series [NH3-(CH2)(5)-NH3] MnCl4; 1,5 di-aminepentane tetrachloro mangenate were prepared by slow evaporation and temperature decrease method, characterized by single crystal X-ray diffraction. This complex exhibits excellent catalytic activity towards sulphide oxidation and alkene oxidation using aqueous H2O2 as an oxidant. [GRAPHICS] .