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

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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 ortho-formylation of phenols using chloroform (CHCl3) in the presence of a strong base, typically sodium hydroxide (NaOH). The reaction leads to the formation of an ortho-hydroxybenzaldehyde.

### Step 2: Identify the Reactants
In this reaction, the key reactants are:
- Phenol (C6H5OH)
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