Question:
Benzene diazonium chloride on treatment with HCl in the presence of copper powder gives chlorobenzene. This reaction is termed as
Benzene diazonium chloride on treatment with HCl in the presence of copper powder gives chlorobenzene. This reaction is termed as
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Difference:
- Sandmeyer $\rightarrow$ Cu salts
- Gattermann $\rightarrow$ HCl/HBr + Cu powder
Updated On: Apr 30, 2026
- Sandmeyer reaction
- Gattermann reaction
- Stephen reaction
- Gattermann Koch reaction
- Etard reaction
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The Correct Option is B
Solution and Explanation
Concept:
Diazonium salts undergo substitution reactions:
• Sandmeyer reaction: Uses $\mathrm{CuCl/CuBr/CuCN}$
• Gattermann reaction: Uses $\mathrm{HCl/HBr}$ with copper powder
Step 1: Given reaction.
\[ \mathrm{C_6H_5N_2^+Cl^- \xrightarrow{HCl/Cu} C_6H_5Cl + N_2} \]
Step 2: Identify reagent.
Presence of $\mathrm{HCl}$ and copper powder $\Rightarrow$ Gattermann reaction
Step 3: Conclusion.
Reaction is Gattermann reaction.
• Sandmeyer reaction: Uses $\mathrm{CuCl/CuBr/CuCN}$
• Gattermann reaction: Uses $\mathrm{HCl/HBr}$ with copper powder
Step 1: Given reaction.
\[ \mathrm{C_6H_5N_2^+Cl^- \xrightarrow{HCl/Cu} C_6H_5Cl + N_2} \]
Step 2: Identify reagent.
Presence of $\mathrm{HCl}$ and copper powder $\Rightarrow$ Gattermann reaction
Step 3: Conclusion.
Reaction is Gattermann reaction.
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