What is the missing reagent in the following reaction sequence?

Question

Quizplus · Accepted Answer

The reaction sequence involves reduction of a nitro group to an amine, which is typically done using a reducing agent such as sodium or iron with an acid, followed by acylation of the resulting amine with an acid chloride. The missing reagent is therefore a source of acid, which is provided by option C in the form of NaN3 followed by HCl. Option A would also work, but it uses CO which is a toxic gas and impractical for most laboratory settings. Option B is not a real reagent or compound. Option D would not provide the necessary acidic conditions for the acylation step. Option E provides only a source of sodium and ammonia, which are not sufficient for this reaction sequence.

What Is the Missing Reagent in the Following Reaction Sequence