The product A formed in the following reaction is:

### Related Formula textAr-NH_2 xrightarrowtextNaNO_2 + textHCl, 0^circtextC textAr-N_2^+textCl^- xrightarrowtextCu_2textCl_2 textAr-Cl$$\text{Ar-NH}_2 \xrightarrow{\text{NaNO}_2 + \text{HCl}, 0^\circ\text{C}} \text{Ar-N}_2^+\text{Cl}^- \xrightarrow{\text{Cu}_2\text{Cl}_2} \text{Ar-Cl}$$ ### Core Logic The schematic outlines a classic sequence: 1. **Diazotization Step**: Aniline reacts with nitrous acid generated in situ (textNaNO_2 + textHCl$\text{NaNO}_2 + \text{HCl}$) at low temperature (0-5^circtextC$0-5^\circ\text{C}$) to form benzene diazonium chloride intermediate. 2. **Sandmeyer Replacement Step**: Treating the diazonium salt with cuprous chloride (textCu_2textCl_2$\text{Cu}_2\text{Cl}_2$) results in replacement of the diazo group by a chlorine atom. ### Step 1: Visual Verification Tracing structural shifts through intermediates validates the final outcome:

### Pattern Recognition Aniline rightarrow$\rightarrow$ Diazonium salt rightarrow$\rightarrow$ Chlorobenzene via standard Sandmeyer synthesis protocols. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Chemistry: Organic Compounds Containing Nitrogen