📚 A-Level Chemistry: Organic Reaction Mechanisms Explained | A-Level 化学：有机反应机理详解
Understanding organic reaction mechanisms is central to A-Level Chemistry. A mechanism is a step-by-step description of how covalent bonds break and form during a reaction, showing the movement of electrons and the structures of any intermediates or transition states.
理解有机反应机理是 A-Level 化学的核心。反应机理逐步描述反应过程中共价键如何断裂与生成，展示电子的移动方向以及任何中间体或过渡态的结构。
1. Why Mechanisms Matter | 为什么反应机理重要
A mechanism is not just a theoretical drawing; it explains how and why a reaction proceeds. Once you can read curly arrows, you can work out which bonds break, which bonds form, and which species act as nucleophiles or electrophiles. This skill turns memorising hundreds of reactions into understanding a few logical patterns.
反应机理不只是理论图示，它解释反应如何进行以及为何如此进行。一旦你会读弯箭头，就能推断哪些键断裂、哪些键形成、哪些物种作为亲核体或亲电体。这项技能把大量需要记忆的反应转化为少数符合逻辑的规律。
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Predicting products for new combinations of reagents.
能够预测新试剂组合的产物。
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Explaining relative rates, such as why tertiary haloalk
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