Step 1: Understanding the Question:
The question asks to identify the specific reagents for a named organic reaction.
The topic is Phenols. Step 2: Key Formula or Approach:
The Reimer--Tiemann reaction involves the introduction of a \( -CHO \) group into the ortho-position of the benzene ring of phenol. Step 3: Detailed Explanation:
In this reaction, Phenol reacts with Chloroform (\( CHCl_3 \)) in the presence of an alkali (\( NaOH \)).
This generates a dichlorocarbene intermediate, which attacks the phenoxide ion.
Subsequent hydrolysis leads to the formation of o-hydroxybenzaldehyde (Salicylaldehyde). Step 4: Final Answer:
The required reagents are \( CHCl_3 \) and \( NaOH \).