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(C) The reduction of nitro compounds to amines is commonly carried out using metal-acid combinations like $Fe/HCl$ or $Sn/HCl$. $Fe/HCl$ is preferred

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$Fe$ and $HCl$

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(C) The reduction of nitro compounds to amines is commonly carried out using metal-acid combinations like $Fe/HCl$ or $Sn/HCl$. $Fe/HCl$ is preferred in industrial processes because $FeCl_2$ formed during the reaction gets hydrolyzed to release $HCl$ gas,which then reacts with more $Fe$ to continue the cycle. Thus,only a small amount of $HCl$ is required to initiate the reaction,making it more economical than $Sn/HCl$.

Which is a better reagent for the reduction of an aryl nitro compound to an amine?

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The total number of amines among the following which can be synthesized by Gabriel phthalimide synthesis is:
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$(B)$ $CH_3CH_2NH_2$
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$(D)$ $C_6H_5-NH_2$

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