Question:
Which of the following is a commercial method of manufacture of benzaldehyde?
Which of the following is a commercial method of manufacture of benzaldehyde?
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- Commercial methods favor simple reagents and high yield
- Side-chain reactions of toluene are widely used industrially
Updated On: Apr 30, 2026
- Hydrogenation of benzoyl chloride with $\mathrm{Pd/BaSO_4}$ as catalyst.
- Oxidation of toluene with chromyl chloride followed by hydrolysis
- Toluene is treated with $\mathrm{Cr_2O_3}$ in acetic anhydride followed by hydrolysis
- Side chain chlorination of toluene followed by hydrolysis
- Benzene is treated with CO and HCl in the presence of anhydrous $\mathrm{AlCl_3}$
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The Correct Option is D
Solution and Explanation
Concept:
Commercial preparation methods focus on cost-effectiveness and large-scale feasibility.
Step 1: Understand the process.
Toluene undergoes side-chain chlorination: \[ \mathrm{C_6H_5CH_3 \xrightarrow{Cl_2/h\nu} C_6H_5CH_2Cl} \]
Step 2: Hydrolysis step.
\[ \mathrm{C_6H_5CH_2Cl \xrightarrow{H_2O} C_6H_5CHO} \]
Step 3: Conclusion.
This is an economical industrial method for benzaldehyde.
Step 1: Understand the process.
Toluene undergoes side-chain chlorination: \[ \mathrm{C_6H_5CH_3 \xrightarrow{Cl_2/h\nu} C_6H_5CH_2Cl} \]
Step 2: Hydrolysis step.
\[ \mathrm{C_6H_5CH_2Cl \xrightarrow{H_2O} C_6H_5CHO} \]
Step 3: Conclusion.
This is an economical industrial method for benzaldehyde.
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