What salt is formed when primary aromatic amines such as aniline react with nitrous acid (NaNO2 + HCl) at 0 to 5 degrees Celsius?
Answer and explanation
Correct answer: B. Arenediazonium salt
Primary aromatic amines react with cold nitrous acid at 0-5 degrees C to undergo diazotization, forming arenediazonium salts ([Ar-N#N]+ Cl-), which are valuable synthetic intermediates for azo dyes and Sandmeyer substitutions.
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