The conversion of m-nitrophenol to resorcinol involves respectively

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Reduction, diazotization and hydrolysis

Hydrolysis, diazotization and reduction

Hydrolysis, reduction and diazotization

Diazotisation, reduction and hydrolysis

answer is D.

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Detailed Solution

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:

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

$m-nitrophenol$ $Sn/HCl or Fe/HCl$

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: