Question

Which of the following reagents is required for the conversion of Benzene to methyl benzoate?
(A) Br\(_2\)/FeBr\(_3\)
(B) Mg, dry Ether
(C) CO\(_2\), H\(_3\)O\(^+\)
(D) Methanol, Conc. H\(_2\)SO\(_4\)

• A. (A), (B) and (C) only
• B. (A), (B) and (D) only
• C. (A), (B), (C) and (D)
• D. (B), (C) and (D) only

Hint:

The Friedel-Crafts acylation is a key reaction for adding an acyl group to aromatic compounds, while Grignard reagents help add alkyl groups.

Answer 1

The Correct Option is C

Step 1: Friedel-Crafts Acylation (A).
To synthesize methyl benzoate from benzene, a Friedel-Crafts acylation is employed. This reaction utilizes acylating agents such as \[CO_2\] in the presence of a catalyst like FeBr\(_3\).
Step 2: Grignard Reagent Formation (B).
The Grignard reagent, typically formed from Mg in dry ether, facilitates the nucleophilic addition of a methyl group to the carbonyl carbon of methyl benzoate.
Step 3: Carbonation (C).
Carbon dioxide (\[CO_2\]) is introduced, followed by aqueous acidic workup (\[H_3O^+\]), to form the methyl ester intermediate.
Step 4: Esterification (D).
The final esterification step involves reacting the intermediate compound with methanol and concentrated sulfuric acid (\[H_2SO_4\]) to yield methyl benzoate.
Conclusion:
All steps (A), (B), (C), and (D) are necessary for the conversion of Benzene to methyl benzoate.
Final Answer: \[\boxed{\text{The correct answer is (A), (B), (C) and (D).}}\]