Question:
Consider the following organic reaction sequence. Choose the final product (X) from the following (consider the major product in all intermediate reactions).
Consider the following organic reaction sequence. Choose the final product (X) from the following (consider the major product in all intermediate reactions).
Updated On: Apr 12, 2026
- Benzene
- Phenol
- Propanol
- Chlorobenzene
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The Correct Option is B
Solution and Explanation
Concept:
The sequence involves formation of an amine, Hofmann rearrangement, diazotization and azo coupling.
Step 1: {Alcohol with \(NH_3\)}
Alcohol converts to the corresponding amine.
\[
R-OH \rightarrow R-NH_2
\]
Step 2: {Reaction with \(Br_2/NaOH\)}
This is Hofmann bromamide degradation.
\[
RCONH_2 \rightarrow RNH_2
\]
It produces a primary amine with one carbon less.
Step 3: {Reaction with \(HNO_2\)}
Primary aromatic amines form diazonium salts:
\[
ArNH_2 \rightarrow ArN_2^+Cl^-
\]
Step 4: {Hydrolysis of diazonium salt}
Diazonium salts on hydrolysis give phenol.
\[
ArN_2^+Cl^- \rightarrow ArOH
\]
Thus final product:
\[
\text{Phenol}
\]
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