Today in order to protect our environment, the challenge facing organic chemist is to design syntheses that use reactants and generate products that cause little or no toxicity to the environment. Preventing pollution at the molecular level is known as green chemistry. Green Chemistry is a proactive approach to pollution prevention. It targets pollution at the design stage, before it even begins. If chemists aretargets to develop products and materials in a manner that does not use hazardous substances, than much waste, hazards and cost can be avoided. Green Chemistry is designing chemical products and processes that reduce or eliminate the use and or the generation of hazardous substances. Think about the simple equation of risk, Risk = Hazard x Exposure. Traditional approaches to pollution prevention focus on mitigating the hazards or end of pipe pollution prevention controls. These traditional technologies focus on limiting the exposure of a hazardous material. Unfortunately, exposure precautions can and will fall. Green Chemistry goes to the root of the problem and aim to eliminate the hazards itself. Green chemistry is the onlyscience that focuses on the intrinsic hazard of a chemical or chemical process .It seeks to minimize or eliminate that hazard so that we do not have to worry about exposure. Green Chemistry is not environmental chemistry. Green chemistry targets pollution prevention at the source during the design stage of a chemical product or process and thus prevents pollution before it begins. Green chemistry basically based on twelve principles, they are a set of guidelines that chemist use in order to perform chemistry in a better way. As you take a closer look at them, you will find they are intuitive and simply good practice.The 12 principles of green chemistry are as following