Studies on enzyme inhibition remain an important area of pharmaceutical research since these studies have led to the discoveries of drugs useful in a variety of physiological conditions. The enzyme inhibitors can interact with enzymes and block their activity towards natural substrates. Urease inhibitors have recently attracted much attention as potential new anti-ulcer drugs. A series of novel substituted pyrazoles 8(a-j) has been synthesized by diazotization of fluoro chloro aniline (1) and the reaction of the corresponding diazonium salt solution (2) with ethyl cyanoacetate (3) to give the intermediate, ethyl 2-((3-chloro-4-fluorophenyl) diazenyl-2- cyanoacetate (4). The intermediate is then cyclised with chloroacetonitrile (5) using triethyl amine as the base to give the final compound, ethyl 4-amino-1-(3-chloro-4-flurophenyl)-5- cyano-1H-pyrazole-3-carboxylate (6). Nucleophilic substitution group is removed from the final compound and 8(a-j) derivatives have been synthesized. All the synthesized compounds were characterized by physical data (M.P. & TLC) and spectral Data (IR & 1H NMR). The synthesized compounds were evaluated for urease-inhibition activity. Molecular docking studies were carried out for these compounds with the enzyme urease. From the observations it has been noticed that some of the compounds possesses remarkable urease-inhibitory effect.