Question

Identify the reactant, reagent, and solvent to synthesize the following Grignard reagent. Note: If one or more items are incorrectly placed, a single red X will appear on the top left.

Answer 1

Concepts and reason

Grignard reagents are organomagnesium halides having the general formula ${\rm{R - MgX}}$ where ${\rm{X}}$ can be ${\rm{Cl,}}\,{\rm{Br,}}\,{\rm{or}}\,{\rm{I}}$ and ${\rm{R}}$ can be an alkyl, alkenyl, alkynl, aralkyl or aryl group or may also be an alicyclic or a heterocyclic group.

The carbon-magnesium bond in a Grignard reagent is a highly polar covalent bond the magnesium-halogen bond is essentially ionic.

$\mathop {\rm{R}}\limits^{{{\rm{\delta }}^{\rm{ - }}}} {\rm{ - }}\mathop {{\rm{Mg}}}\limits^{{{\rm{\delta }}^{\rm{ + }}}} {\rm{X}}$

Fundamentals

Grignard reagents is synthesized by using alkyl halide and magnesium metal in presences of ether as solvent.

${\rm{R - X}}\,{\rm{ + }}\,{\rm{Mg}}\,\longrightarrow{{{\rm{ether}}}}\,{\rm{R - Mg - X}}$

Given product,

${\rm{R}}$ and ${\rm{X}}$ part of the product and reagent are same in the reaction.

Therefore, the alkyl halide reactant is

Reagent for the reaction is ${\rm{Mg}}$

Solvent for the reaction is ether. In given ether is ${\rm{C}}{{\rm{H}}_{\rm{3}}}{\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{OC}}{{\rm{H}}_{\rm{2}}}{\rm{C}}{{\rm{H}}_{\rm{3}}}$

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