When glycol is heated with dicarboxylic acid, the products are:

Options

A. Polyesters
B. Polyethers
C. Polyethylene
D. No reaction at all

Answer

To solve the question of what products are formed when glycol is heated with dicarboxylic acid, we can follow these steps:

### Step 1: Identify the Reactants
- **Glycol**: The simplest glycol is ethylene glycol, which has the formula \( \text{C}_2\text{H}_6\text{O}_2 \) or \( \text{HO-CH}_2\text{-CH}_2\text{-OH} \).
- **Dicarboxylic Acid**: A common example is terephthalic acid, which has the formula \( \text{HOOC-} \text{C}_6\text{H}_4\text{-COOH} \).

### Step 2: Understand the Reaction
When glycol is heated with a dicarboxylic acid, a condensation reaction occurs. In this reaction, the hydroxyl groups (-OH) from both glycol and the dicarboxylic acid react to form water (H2O) as a byproduct.

### Step 3: Write the Reaction
The general reaction can be represented as:
\[ \text{HO-CH}_2\text{-CH}_2\text{-OH} + \text{HOOC-COOH} \rightarrow \text{Polyester} + n \text{H}_2\text{O} \]
Here, n represents the number of dicarboxylic acid molecules reacting with glycol.

### Step 4: Identify the Product
The product formed from this reaction is a **polyester**. Polyesters are formed through the esterification process where water is eliminated, and the hydroxyl groups from the glycol and carboxylic groups from the dicarboxylic acid form ester linkages.

### Step 5: Conclusion
Thus, when glycol is heated with dicarboxylic acid, the main product formed is **polyester** along with the release of water molecules.

### Final Answer
The products are **polyesters** formed when glycol is heated with dicarboxylic acid.

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