Which of the following sets of reagents, used | vedclass

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Question

(B) The conversion of $p$-chloronitrobenzene to $p$-chlorophenol involves the following steps:$1$. Reduction of the nitro group $(-NO_2)$ to an amino

Vedclass · Accepted Answer

$1. Fe, HCl; 2. NaOH; 3. NaNO_2, H_2SO_4; 4. H_2O, \Delta$

Vedclass · Answer

(B) The conversion of $p$-chloronitrobenzene to $p$-chlorophenol involves the following steps:$1$. Reduction of the nitro group $(-NO_2)$ to an amino group $(-NH_2)$ using $Fe/HCl$ to form $p$-chloroaniline.$2$. Diazotization of $p$-chloroaniline using $NaNO_2$ and $H_2SO_4$ (or $HCl$) at $0-5^{\circ}C$ to form $p$-chlorobenzenediazonium salt.$3$. Hydrolysis of the diazonium salt by heating with water $(H_2O, \Delta)$ to yield $p$-chlorophenol.Therefore, the correct sequence is $1. Fe, HCl; 2. NaNO_2, H_2SO_4; 3. H_2O, \Delta$. Option $B$ matches this sequence (noting that the $NaOH$ step in the options is redundant or implied for neutralization if needed, but the core reagents for the transformation are $Fe/HCl$, $NaNO_2/H_2SO_4$, and $H_2O/\Delta$).

Which of the following sets of reagents, used in the order shown, would enable the preparation of $p$-chlorophenol from $p$-chloronitrobenzene?

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