The question asks to identify the statement that is NOT among the twelve principles of green chemistry.

Analyzing the Principles of Green Chemistry

The twelve principles of green chemistry provide guidelines for designing chemical products and processes that reduce or eliminate the use and generation of hazardous substances. Let's examine each option:

• Option 1: Waste Prevention Emphasis
  This aligns directly with the first principle of green chemistry: Prevention, which states it is better to prevent waste than to treat or clean up waste after it has been created.
• Option 2: Energy Minimization
  This corresponds to the sixth principle: Design for Energy Efficiency. Chemical processes should be conducted at ambient temperature and pressure whenever possible, and energy requirements should be recognized for their environmental and economic impacts and minimized.
• Option 4: Avoiding Hazardous Substances
  This relates closely to several principles, particularly Principle 3 (Less Hazardous Chemical Syntheses) and Principle 4 (Designing Safer Chemicals). These principles focus on minimizing or eliminating the hazard associated with chemical substances used and produced.
• Option 3: Maximizing Plant-Based Products
  While Principle 7 promotes the Use of Renewable Feedstocks (which can include materials derived from plants), the statement "Maximize use of products from green plants" is not an exact principle. Green chemistry encourages the use of renewable resources over depleting ones, but the emphasis is on renewability and sustainability, not necessarily maximizing plant-derived products in all cases. This specific phrasing is not one of the twelve established principles.

Conclusion

Based on the analysis, the statement that is NOT one of the twelve principles of green chemistry is the maximization of products specifically from green plants, as presented in Option 3.