Answer 1

• The ability of chemists to redesign chemical transformations to minimize the generation of hazardous waste is an important step in pollution prevention.
• By preventing waste generation we minimize hazards associated with waste storage,transportation & treatment.
• Greener route of indigo creates very less wastage due to renewable feedstock and enzymes used in conventional synthesis such as aniline,chloroacetic acid are avoided.Overall atom economy increases.
• Other example include green synthesis of Ibuprofen & adipic acid.