题干

有机物H是一种香料,可从柑橘类物质中提取,它的一种合成路线如下 

 已知:

①D能与碳酸氢钠溶液反应

②G核磁共振氢谱显示其分子中含有2种不同化学环境的氢原子;

③CH3CHO+CH3CHO

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