Question

Write the balanced equation for the formation of benzoic acid from the Grignard reagent. Include all reagents and products but not solvents.

Answer 1

The balanced chemical equation for the conversion of a Grignard reagent to benzoic acid is C6H5MgBr + CO2 + H2O + HCl → C6H5CO2H + MgBrCl.

Step-by-step explanation:

To create benzoic acid from a Grignard reagent, you would first prepare the Grignard reagent from bromobenzene and magnesium in an ether solution. Then, you would react this with carbon dioxide to form magnesium benzoate, followed by acidification to yield benzoic acid. The reaction sequence is as follows:

• PhBr + Mg → PhMgBr (Formation of the Grignard reagent)
• PhMgBr + CO₂ → PhCO₂MgBr (Reaction with carbon dioxide)
• PhCO₂MgBr + H₂O + HCl → PhCO₂H + MgBrCl (Acidification to form benzoic acid)

Here, Ph represents the phenyl group (C₆H₅), and PhCO₂H represents benzoic acid. The balanced chemical equation for the conversion of a Grignard reagent to benzoic acid, excluding solvents, would be:

C₆H₅MgBr + CO₂ + H₂O + HCl → C₆H₅CO₂H + MgBrCl

Answer 2

The correct answer is - C6H5MgBr + CO2 → C7H6O2 (without solvent)

Step-by-step explanation:

Grignard reagents are the reagents formed by the chemical reaction between magnesium with an alkenyl or alkyl halide which are represented by the chemical formula RMgX where X stands for the halogen, and R is an alkyl or aryl group. These alkyl or aryl groups are based on the benzene ring.

The nature of these reagents are nucleophilic react with electrophiles such as epoxides or carbonyl groups. The formation of benzoic acid is possible with the reaction of the Grignard reagent with the carbon dioxide In H3O+ to form benzoic acid with MgBrOH.

C6H5MgBr + CO2 → C7H6O2