The reagent 'R' in the given sequence of a chemical reaction is:

Question

Accepted Answer

1. **Context Missing:** The specific reaction sequence is not fully provided in the text. However, based on the subtopic of 'Diazonium Salts' and the given options, we can infer the type of reaction.
2. **Reduction of Diazonium Salts:** Mild reducing agents such as ethanol ($CH_3CH_2OH$) or hypophosphorous acid ($H_3PO_2$) are used to reduce diazonium salts to corresponding arenes (like benzene).
3. **Reaction Mechanism:** In this redox reaction, the diazonium salt is reduced to an arene, releasing nitrogen gas, while ethanol is oxidized to ethanal ($CH_3CHO$).
   Chemical Equation: $ArN_2^+Cl^- + CH_3CH_2OH \rightarrow ArH + N_2 + CH_3CHO + HCl$
4. **Conclusion:** Therefore, ethanol ($CH_3CH_2OH$) is the correct reagent 'R' used for this conversion.

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