“氟利昂”因破坏大气臭氧层已被禁用,其实际是一些氯和氟取代的

“氟利昂”因破坏大气臭氧层已被禁用,其实际是一些氯和氟取代的含一、二个碳原子的多卤代烷。它们的商业代号有特殊规定,如F114则为C2Cl2F4,即“114”的百位数字为碳原子数减1,十位数字为氢原子数加1,个位数字代表氟原子数,则Fl34应为(    )

答案

解析:F114为C2Cl2F4,其中“114”中的百位数字1代表碳原子数减1,十位数字1代表氢原子数加1为1,则原物质中氢原子数为0,个位数字则代表4个氟原子。F134中百位数字为1,则碳原子数为1+1=2,十位数字为3,则氢原子数为3-1=2,个位数字为4,则氟原子数为4,因此,该物质的分子式为C2H2F4

答案:C

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