Which statement is not correct for zeolites?

Options

A. These are shape selective catalysts
B. All zeolites convert alcohol directly into.gasoline
C. These are microporous aluminosilicates
D. Many zeolites are found in nature

Answer

To determine which statement is not correct for zeolites, we will analyze each option provided in the question.

### Step 1: Analyze the Statements

1. **Shape Selective Catalysts**: Zeolites are known to be shape-selective catalysts. This means that their porous structure allows them to selectively catalyze reactions based on the size and shape of the reactant and product molecules. This statement is **correct**.

2. **All Zeolites Convert Alcohol Directly into Gasoline**: This statement claims that every type of zeolite can convert alcohol into gasoline. However, this is not true. Only specific types of zeolites, such as those from the pentacyl family (e.g., ZSM-5), are capable of this conversion. Therefore, this statement is **not correct**.

3. **Micro Porous Aluminosilicates**: Zeolites are indeed micro porous aluminosilicates, which means they have a three-dimensional network structure composed of aluminum, silicon, and oxygen. This statement is **correct**.

4. **Many Zeolites are Found in Nature**: Zeolites can be naturally occurring as well as synthesized in laboratories. Therefore, this statement is also **correct**.

### Conclusion

From the analysis above, the statement that is **not correct** for zeolites is: **"All zeolites convert alcohol directly into gasoline."**

### Final Answer
The statement that is not correct for zeolites is: **"All zeolites convert alcohol directly into gasoline."**

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