JEE Main levelSingle correct optionDifficulty 2 of 3ev196
Monitoring a reaction while it proceeds, so that formation of hazardous by-products can be detected and stopped, corresponds to which principle of green chemistry?
AReal-time analysis for pollution prevention
BDesign of safer chemicals
CAtom economy
DUse of catalysts
Answer: A
The principle of real-time analysis uses in-process monitoring and control before hazardous substances form. It is distinct from catalysis or atom economy.