Which of the following are endothermic processes?

Options

A. Combustion of glucose
B. Decomposition of water
C. Dehydrogenation of ethane to ethene
D. Conversion of graphite to diamond

Explanation

To determine which of the processes listed are endothermic, we need to understand what an endothermic process is. An endothermic process is one that absorbs energy (usually in the form of heat) from its surroundings. Let's analyze each option step by step:

### Step 1: Analyze the combustion of glucose
- **Process**: Combustion of glucose (C6H12O6).
- **Nature**: Combustion is a chemical reaction that typically releases energy.
- **Conclusion**: This process is exothermic, not endothermic.

### Step 2: Analyze the decomposition of water
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