Grignard reagent is usually prepared by R - X + Mg Et _ 2 O RMgX Grignard reagent Ar - X…
Chemistry · JEE Advanced · NTA Exams — Alkyl and Aryl Halides
Grignard reagent is usually prepared by
\(\mathrm{R}-\mathrm{X}+\mathrm{Mg} \xrightarrow{\mathrm{Et}_{2} \mathrm{O}} \mathrm{RMgX}\) Grignard reagent
\(\mathrm{Ar}-\mathrm{X}+\mathrm{Mg} \xrightarrow{\mathrm{Et}_{2} \mathrm{O}} \mathrm{ArMgX}\) Grignard reagent
Grignard reagent acts as a strong base. Grignard reagent carry out nucleophilic attact k in absence of acidic hydrogen. Grignard reagent form complex with its ether solvent. Complex formation with molecule of ether is an important factor in the formation and stability of Grignard reagent.
What is the correct order of reactivity of halides with magnesium ?
- R – Cl > R – Br > R – I
- R – Br > R – Cl > R – I
- R – I > R – Br > R – Cl
- R – I = R – Br = R – Cl
Answer
(C) R – I > R – Br > R – Cl
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