alleryA GRIGNARD REAGENT is formed by reacting an alkyl halide with
Asodium metal in dry ether
Bmagnesium metal in dry ether
Czinc dust in acetic acid
Dlithium in liquid ammonia
Answer & Solution
Correct answer: B. magnesium metal in dry ether
1. Your syllabus: a Grignard reagent has the general formula $\mathrm{R{-}MgX}$ (alkyl magnesium halide).
2. Preparation: $\mathrm{R{-}X} + \mathrm{Mg} \xrightarrow{\text{dry ether}} \mathrm{R{-}MgX}$.
3. The dry ether is CRUCIAL — moisture would destroy the Grignard. Ether also stabilises the organo-magnesium species through Lewis-base coordination.
4. Grignard reagents are extremely useful — they add to carbonyl compounds to give alcohols of arbitrary length, used in countless syntheses.
5. Option A is the Wurtz reaction (gives a coupled alkane, not a Grignard). Option C is for organozinc (Reformatsky reagent). Option D is for the Birch reduction conditions, not Grignard.
_Source: syllabus Chemistry Part 2, Ch 6, §6.5 (Grignard reagent preparation), p. 14–15._
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