这里我想谈一下与有机化合物的实验式有关的一个小问题。一个新的化合物,经过元素分析后,就可以凑出它的实验式来。实验式中的氢原子有时只能是单数,有时却只能是双数。这虽然很简单,但恐怕有很多人不太注意,所以在文献上偶而还可以看到一些由此而产生的错误。含碳氢的化合物,都可以看作是甲烷(CH_4)的衍化物。在甲烷的碳与氢之间加入一些 CH_2,就可以形成直链化合物(A)。再在直链化合物的碳与氢之间加入一些 CH_2,就可以形成有支链的化合物(B)。若形成一个双键或形成一个环,就要减去二个氢,形成一个叁键就要减去四个氢。由此看来,仅含碳氢的化合物 Here I would like to talk about a small problem associated with the experimental formula of organic compounds. A new compound, after elemental analysis, can scrape its experimental formula. In the experimental formula, the hydrogen atoms can only be singular sometimes, but sometimes it can only be a double number. Although this is very simple, but I am afraid many people do not pay attention, so occasionally in the literature can also see some of the resulting errors. Hydrocarbon-containing compounds, can be seen as methane (CH_4) derivatives. A linear compound (A) can be formed by adding some CH 2 between the carbon and hydrogen of methane. And then add some CH_2 between the carbon and hydrogen of the straight-chain compound to form the branched compound (B). If you form a double bond or form a ring, subtract two hydrogens and subtract four hydrogens from forming a triple bond. Seen in this light, only hydrocarbon-containing compounds