(a) Green chemistry is a production process that would bring about minimum pollution or deterioration to the environment. Green chemistry aims at : (a) Use of environment friendly medium for the reaction; and (b) Use of methods that completely convert the reactants to products such that there are no harmful side-products formed. This is arrived at by working out optimum conditions for synthesis such that there are no harmful side-products formed. Thus, green chemistry produces products which have no adverse impact on the environment.