烃是一类重要的有机物,也是中学有机化学的重要基础,其中有很多的重要的规律,在解题时有着非常重要的作用,现将有关规律及应用作如下归纳: 一、奇偶数规律由于碳原子以四个键与其它碳原子或氢原子成键,所以烃分子中含氢原子数恒为偶数,其相对分子质量也恒为偶数;烃类物质的一价烃 Hydrocarbons are an important class of organic matter, and they are also an important basis for organic chemistry in middle schools. There are many important laws that play a very important role in solving problems. Now we will summarize the relevant laws and applications as follows: 1. The law of odd and even numbers Carbon atoms are bonded to other carbon atoms or hydrogen atoms with four bonds, so the number of hydrogen atoms in the hydrocarbon molecules is always even, and the relative molecular weight is always even; hydrocarbons are monovalent hydrocarbons.