In which of the following processes shape-selective catalysis is occuring

Options

A. Conversion of alcohol to gasoline
B. Synthesis of methanol from CO and `H_(2)`
C. Polymerisation of ethylene
D. Synthesis of ammonia

Explanation

To solve the question regarding which processes involve shape-selective catalysis, we can follow these steps:

### Step 1: Understand Shape-Selective Catalysis
Shape-selective catalysis refers to a process where the catalyst selectively facilitates a reaction for specific molecular shapes or sizes. This is often achieved using materials like zeolites, which have a porous structure that allows only certain reactants to enter and react.

**Hint:** Remember that shape-selective catalysis is about the size and shape of the reactant molecules fitting into the catalyst.

### Step 2: Identify the Catalysts
The primary catalysts known for shape-selective catalysis are zeolites. Zeolites are aluminosilicates with a specific structure that can selectively adsorb certain molecules based on their size and shape.

**Hint:** Focus on the properties of zeolites and their ability to act as selective catalysts.

### Step 3: Analyze the Given Processes
The question provides several processes. We need to determine which of these processes utilize zeolites for shape-selective catalysis. Common applications of zeolites include:
- The conversion of alcohols to gasoline.
- The polymerization of ethylene.

**Hint:** Think about common industrial processes where zeolites are applied.

### Step 4: Match Processes with Shape-Selective Catalysis
From the information gathered:
1. The conversion of alcohols to gasoline is a process where zeolites are used for shape-selective catalysis.
2. The polymerization of ethylene is also catalyzed by zeolites.

**Hint:** Check if the processes mentioned are related to the use of zeolites.

### Step 5: Select the Correct Options
Based on the analysis, the processes that involve shape-selective catalysis are:
- Option 1: Conversion of alcohols to gasoline.
- Option 3: Polymerization of ethylene.

**Hint:** Look for the processes that are explicitly mentioned in the context of zeolite catalysis.

### Final Answer
The correct answers are Option 1 and Option 3, as both processes involve shape-selective catalysis using zeolites.