Question

The reaction that produces o-bromophenol as the major product is 

• A. A
• B. B
• C. C
• D. D

Hint:

Phenol + Br$_2$/CS$_2$ at low temperature → selective ortho substitution.

Answer 1

The Correct Option is A

Step 1: Understand bromination of phenols. 
Phenols are strongly activating and \emph{o,p}-directing. When bromination is carried out in a non-aqueous solvent such as CS$_2$ at low temperature, monobromination occurs predominantly at the ortho position. 
Step 2: Evaluate the options. 
(A) and (B) involve conditions that lead to rearrangements or decomposition, not selective ortho bromination. 
(D) involves benzyne formation and substitution at unpredictable positions. 
(C) Br$_2$/CS$_2$ at 0 °C specifically gives ortho-bromophenol as the major product because para attack is sterically hindered. 
Step 3: Conclusion. 
Thus, option (C) produces o-bromophenol as the major product.