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2．3-甲基-2-戊酮在m/z 72处有一吸收峰，该峰是Mclafferty重排裂解产生的碎片离子峰，试写出其裂解过程。

3．某未知物经TLC及HPLC分析，证明其纯度在98%以上。经质谱测得分子离子峰的精确质量（m/z）为150.0680，分子式为C9H10O2。所测得的MS、IR 及1H NMR如图所示，试由综合光谱解析，确定其分子结构式。

4．某未知物，由质谱测得分子离子峰的质荷比为179，由同位素峰强比求得分子式为C10H13NO2。测得的MS、IR及1H NMR如图所示。试推断未知物的分子结构式。

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