In the present study chemical pretreatment processes of corncob carried out by commonly used dilute H2SO4 and NaOH with varied concentrations. During pretreatment step, solid to liquid ratio varied to understand the effect on pretreatment and the concentration of sugar released. Further pretreated corncobs subjected to crude enzymatic hydrolysis to produce reducing sugars. Work is carried out to study the effect of catalyst concentration on concentration of sugars release along with changes in solid to liquid ratio, during the pretreatment and enzymatic hydrolysis.