Name the products formed when:
wood is burnt in the absence of air

Explanation

To answer the question about the products formed when wood is burnt in the absence of air, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Process**:
- When wood is burnt, it typically undergoes a combustion reaction. However, the question specifies that this combustion occurs in the absence of air.

2. **Identifying the Type of Combustion**:
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