烃A的碳元素的质量分数为75%;烃B充分燃烧后生成6.75g水和8.4L二氧化

A的碳元素的质量分数为75%;烃B充分燃烧后生成6.75g水和8.4L二氧化碳(标准状况);烃C中碳的质量是氢的质量的4倍;13gD完全燃烧后生成9g水,写出这四种烃的最简式A        B       C        D       

答案

CH4  CH2  CH3  CH

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