Which statement best defines source reduction in the context of green chemistry?

• A. Disposing of hazardous substances after use
• B. Reducing the generation of hazardous substances at the source
• C. Increasing production speed
• D. Recycling waste after use

Answer: (B)

Source reduction in green chemistry means preventing waste by designing processes that generate less hazardous material in the first place. This is achieved by improving atom economy, choosing safer reagents and solvents, and optimizing conditions to minimize waste and energy use. Because the focus is on stopping waste before it forms, this description best captures the idea. Disposing of hazardous substances after use describes waste treatment, not prevention. Recycling waste after use deals with waste after it’s produced, not how to prevent it. Increasing production speed is about throughput and efficiency, not reducing hazardous waste at the source. So reducing the generation of hazardous substances at the source is the concept that fits best.