Q.

The conversion of m-nitrophenol to resorcinol involves respectively

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a

Reduction, diazotization and hydrolysis

b

Hydrolysis, diazotization and reduction

c

Hydrolysis, reduction and diazotization

d

Diazotisation, reduction and hydrolysis

answer is D.

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Detailed Solution

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The conversion of m-nitrophenol to resorcinol involves two key steps in the chemical reaction pathway:

Reduction of Nitro Group

  • The nitro group (-NO₂) in m-nitrophenol is reduced to an amino group (-NH₂).
  • This can be achieved using reducing agents such as Sn/HCl, Fe/HCl, or catalytic hydrogenation with H₂/Pd.
  • The product of this step is m-aminophenol.

Reaction:

m-nitrophenolSn/HCl or Fe/HClm-aminophenol\text{m-nitrophenol} \xrightarrow{\text{Sn/HCl or Fe/HCl}} \text{m-aminophenol}

Hydrolysis of Amino Group

  • The amino group (-NH₂) in m-aminophenol is replaced with a hydroxyl group (-OH) through hydrolysis.
  • This is commonly done by treating m-aminophenol with aqueous acids or under oxidative conditions.
  • The final product is resorcinol (1,3-dihydroxybenzene).

Reaction:

m-aminophenolHNO₂resorcinol\text{m-aminophenol} \xrightarrow{\text{HNO₂}} \text{resorcinol}

  1. Reduction: m-Nitrophenol → m-Aminophenol
  2. Hydrolysis: m-Aminophenol → Resorcinol

This sequence is crucial for transforming m-nitrophenol into resorcinol efficiently.

 

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