Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Alkenes

烯烃
General formula
CnH2n
通式 CnH2n

Aliphatic hydrocarbons with one double bond between carbons are called alkenes. They follow the naming convention of the alkanes except that the suffix -ene is used instead of -ane. For alkenes above propene the position of the double bond must be specified in the name.

含有一个碳碳双键的脂肪烃称为烯烃。它们的命名规则与烷烃类似，只是后缀用-ene代替-ane。对于丙烯以上的烯烃，必须在名称中指定双键的位置。
ethene
ethylene
乙烯
丙烯
propene
Alkenes are unsaturated hydrocarbons and are generally very reactive. Typical reactions involve the addition of hydrogens or halogens.

The double bond in alkenes can act to bond such molecules together in long chains and sheets. The formation of polymers is an important area of chemistry.

烯烃中的双键可以将这样的分子结合在一起，形成长链和片状结构。聚合物的形成是化学的重要领域。

Aliphatic Hydrocarbons
脂肪族碳氢化合物
 Index

Carbon compounds

Chemistry concepts

Reference
Shipman, Wilson, Todd
Sec 15.2
索引 碳化合物 化学概念 参考 Shipman, Wilson, Todd 第15章第2节
 
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Ethene

乙烯

Ethene is the smallest of the alkene series. More commonly called ethylene, it is an important intermediate in many chemical synthesis processes. Notably, it is used in the manufacture of ethylene glycol for antifreeze. It is also used in the synthesis of ethanol.

乙烯是烯烃系列中最小的一种。更常被称为乙烯，它是许多化学合成过程中的重要中间体。值得注意的是，它用于制造用于防冻剂的乙二醇。它还用于乙醇的合成。

Aliphatic Hydrocarbons
脂肪族碳氢化合物
 Index

Carbon compounds

Chemistry concepts

Reference
Shipman, Wilson, Todd
Sec 15.2
索引 碳化合物 化学概念 参考 Shipman, Wilson, Todd 第15章第2节
 
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Propene

丙烯

Propene is the second member of the alkene series.

丙烯是烯烃系列的第二个成员

Aliphatic Hydrocarbons
脂肪族碳氢化合物
 Index

Carbon compounds

Chemistry concepts

Reference
Shipman, Wilson, Todd
Sec 15.2
索引 碳化合物 化学概念 参考 Shipman, Wilson, Todd 第15章第2节
 
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Butene

丁烯

The third in the alkene series, butene can occur in two different forms, depending on the position of the double bond. The position of the double bond is indicated in the name as shown. Larger alkenes are constructed and named in a similar manner.

烯烃系列中的第三种，丁烯可以以两种不同的形式存在，这取决于双键的位置。双键的位置在名称中如图所示。更大的烯烃也是按照类似的方式构造和命名的。
Aliphatic Hydrocarbons
脂肪族碳氢化合物
 Index

Carbon compounds

Chemistry concepts

Reference
Shipman, Wilson, Todd
Sec 15.2
索引 碳化合物 化学概念 参考 Shipman, Wilson, Todd 第15章第2节
 
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烯烃是不饱和的碳氢化合物，通常非常活泼。典型的反应涉及氢或卤素的加成。