Title of the book is "Synthesis and Spectral Characterization of Novel Organic Compounds of Pyrrole Derivatives, Schiff's Bases, Urea/Thiourea and Carbamate/Sulfonamides."This book is divided into six chapters, they are Chapter-1: General Introduction Chapter-2: Synthesis of Novel Carbamate, Sulfonamide Derivatives of (2'-(1H-Tetrazol-5-yl)-biphenyl-4-yl) methanamine and Their Antibacterial, Antifungal Activities. Chapter-3: Synthesis and Antimicrobial Activity of NovelUrea/Thiourea Derivatives Chapter-4: Synthesis and Antimicrobial Activity of new Carbamate and Sulfonamide derivatives Chapter-5: A Facile, Catalyst- Free Green Synthesis for Schiff's Bases in Aqueous Medium using Ultrasonic Irradiation Conditions and Their Antimicrobial Activity Chapter-6:Synthesis of New Sulfonamide Derivatives of Tryptamine and Their Antimicrobial Activity and Summary