The structure of the intermediate formed in the Riemer Tiemann reaction is :

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D.

Explanation

To determine the structure of the intermediate formed in the Riemer-Tiemann reaction, we can follow these steps:

### Step 1: Understand the Riemer-Tiemann Reaction
The Riemer-Tiemann reaction involves the reaction of phenols with chloroform (CHCl3) in the presence of a strong base, usually sodium hydroxide (NaOH). This reaction leads to the formation of ortho- and para-hydroxybenzaldehydes.

**Hint:** Remember that the Riemer-Tiemann reaction specifically uses chloroform and a strong base to modify phenolic compounds.

### Step 2: Identify the Reactants
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