What do you understand by shape selective catalysis? Why are zeolites good shape selective catalysts?

Explanation

### Step-by-Step Solution:

1. **Definition of Shape Selective Catalysis**:
- Shape selective catalysis refers to a type of catalytic reaction where the structure of the catalyst, particularly its pore size and shape, plays a crucial role in determining which reactants can enter the catalyst's active sites. This selectivity allows the catalyst to favor certain reactions based on the size and shape of the reactant molecules.

2. **Mechanism of Shape Selective Catalysis**:
- In shape selective catalysis, only reactants that fit into the pores of the catalyst can undergo the catalytic reaction. This means that the catalyst can selectively convert certain reactants into products while excluding others based on their molecular size and shape.

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