The terrorist attach which occurred in delhi high court on september 8,2011 used PETN as the deadly explosive. What does PETN stand for and how is it prepared?

Explanation

**Step-by-Step Solution:**

1. **Understanding PETN:**
- PETN stands for Pentaerythritol Tetranitrate. It is a powerful explosive material.

2. **Chemical Structure:**
- PETN is a nitrate ester of pentaerythritol. The chemical structure consists of a pentaerythritol backbone with four nitrate groups attached.

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