Question:
Which from following chemical activities does NOT exhibit good atom economy according to the principles of green chemistry?
Which from following chemical activities does NOT exhibit good atom economy according to the principles of green chemistry?
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Rule:
More by-products $\rightarrow$ Lower atom economy
Updated On: May 8, 2026
- Formation of Grignard reagent.
- Action of HX on alkene to form alkylhalide.
- Action of thionyl chloride on ethanol to form ethyl chloride.
- Formation of cyclohexanol from phenol by catalytic hydrogenation.
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The Correct Option is C
Solution and Explanation
Concept: Atom economy measures how efficiently reactants are converted into desired products.
• High atom economy: Most atoms end up in desired product
• Low atom economy: Significant by-products formed
Step 1: Analyze reactions.
• (A) Grignard formation: Minimal waste
• (B) HX addition to alkene: All atoms incorporated
• (C) $\text{C}_2\text{H}_5\text{OH} + \text{SOCl}_2 \rightarrow \text{C}_2\text{H}_5\text{Cl} + \text{SO}_2 + \text{HCl}$ Large amount of gaseous by-products $\rightarrow$ poor atom economy
• (D) Hydrogenation: Nearly all atoms utilized
Step 2: Conclusion.
Thus, reaction with thionyl chloride does not exhibit good atom economy. Final Answer: Option (C)
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