Question

What is the minimum number of reactions required for the conversion of aniline to 1,3,5-tribromobenzene?

(a) 2

(b) 3

(c) 4

(d) 5

The question was asked in examination.

The above asked question is from Diazonium Salts in Synthesis of Aromatic Compounds topic in portion Amines of Chemistry – Class 12

Answer 1

The correct answer is (b) 3

To explain: The three reactions are as follows:

\(\Rightarrow\) Reaction 1: Aniline on treatment with bromine water gives 2,4,6-tribromoaniline.

\(\Rightarrow\) Reaction 2: This on diazotisation with HNO2 gives 2,4,6-tribromobenzenediazonium chloride.

\(\Rightarrow\) Reaction 3: This on reaction with H3PO2, reduces the diazo group to hydrogen, to give 1,3,5-tribromobenzene.