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**Grignard reagent** R-Mg-X is formed by reacting:
AAlkyl halide with Mg metal in dry ether
BAlkyl halide with hot HCl
CAlkene + HCl
DAlcohol with Na
Answer & Solution
Correct answer: A. Alkyl halide with Mg metal in dry ether
R-X + Mg → R-Mg-X (in anhydrous ether, dry conditions essential — Grignard reacts violently with water/protic compounds). Very powerful nucleophile/base. Reacts with C=O, esters, ethylene oxide etc to build C-C bonds.
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