Question

An aromatic compound has molecular formula C₇H₇Br. Give the possible isomers and the appropriate method to distinguish them.

• A. 3 isomers; by heating with AgNO₃ solution
• B. 4 isomers; by treating with AgNO₃ solution
• C. 4 isomers; by oxidation
• D. 5 isomers; by oxidation

Hint:

AgNO₃ test distinguishes: benzyl halides ≠ aryl halides

Answer 1

The Correct Option is B

Step 1: Possible aromatic isomers of C₇H₇Br: • o-bromotoluene • m-bromotoluene • p-bromotoluene • benzyl bromide (C₆H₅CH₂Br)
Step 2: Total isomers =4.
Step 3: Distinction: • Benzyl bromide gives immediate precipitate with alcoholic AgNO₃ • Aryl bromides (o-, m-, p-) do not react