Grignard Formation
Easychemistry
Formation of Grignard reagent fails in presence of:
Select the correct option:
Solution
Incorrect! Answer:
Moisture / protic impurities
- Synthesis: Grignard reagents (RMgX) are prepared by the reaction of Magnesium metal with alkyl halides in dry ether.
- Nature: Grignard reagents are extremely strong bases and nucleophiles.
- Reactivity with Water: They react instantaneously with any source of protons (acidic hydrogens) like water, alcohols, or amines.
- Mechanism: RMgX+H−OH→R−H+Mg(OH)X.
- Failure: Even a trace of moisture will decompose the reagent into simple alkanes, preventing the desired synthetic application. Therefore, anhydrous conditions are mandatory.
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About This Question
- Subject
- chemistry
- Chapter
- halogen organics
- Topic
- grignard formation
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Moisture / protic impurities
- Synthesis: Grignard reagents (RMgX) are prepared by the reaction of Magnesium metal with alkyl halides in dry ether.
- Nature: Grignard reagents are extremely strong bases and nucleophiles.
- Reactivity with Water: They react instantaneously with any source of protons (acidic hydrogens) like water, alcohols, or amines.
- Mechanism: RMgX+H−OH→R−H+Mg(OH)X.
- Failure: Even a trace of moisture will decompose the reagent into simple alkanes, preventing the desired synthetic application. Therefore, anhydrous conditions are mandatory.
This easy difficulty chemistry question is from the chapter halogen organics, covering the topic of grignard formation. It appeared in the 2025 exam.
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