Distinguish Between Ethanal and Propanal

最好的方法区分乙醛和公关opanal is iodoform test;Ethanal responds to the iodoform test whereas propanal does not respond to the iodoform test.

Ethanal and propanal are simple醛compounds. They differ from each other according to the number of carbon atoms present in their molecules; therefore, they have different chemical and physical properties as well. Ethanal is a colorless liquid with an ethereal odor while propanal is a colorless, flammable liquid having a slightly fruity odor.

内容

1.Overview and Key Difference
2.What is Ethanal
3.What is Propanal
4.What is Iodoform Test
5.Side by Side Comparison – Ethanal vs Propanal in Tabular Form
6.概括

What is Ethanal

Ethanal oracetaldehydeis an organic compound having the chemical formula CH3CHO. This compound is composed of a methyl group attached to an aldehyde functional group; thus, we can abbreviate it as MeCHO where Me refers to Methyl. This is an important aldehyde compound that occurs widely in nature, e.g. occurs naturally in coffee, bread, and ripe fruit. However, it is also produced on a large scale for industrial purposes. Another biological route exists for its preparation; this route involves the partial oxidation ofethanolby the liver enzyme alcohol dehydrogenase and this preparation helps the hangover after alcohol consumption.

在室温和压力下，乙醇作为无色液体出现。关于该物质的一些化学事实如下：

• Chemical formula is C2H4O
• Molar mass is 44.053 g/mol.
• 出现为无色液体。
• This substance has an ethereal odor.
• The melting point is -123.37 Celsius degrees.
• Boiling point is 20.0 Celsius degrees.
• Miscible with water, ethanol, ether, benzene, toluene, etc.
• 该分子在羰基碳原子周围有三角平面，在甲基碳周围的四面体几何形状

There are many different uses of ethanal, including its role as a precursor to acetic acid production, as a starting material in the synthesis of 1-butanol, perfumes, flavorings, aniline dyes, plastics, synthetic rubber, etc.

What is Propanal?

求职或propionaldehydeis a simple aldehyde organic compound having the chemical formula CH3CH2CHO. This is the third member of the aldehyde series. We can observe this substance as a colorless, flammable liquid having a slightly fruity odor.

When considering the production of propanal, we can produce this compound industrially via hydroformylation ofethylene. Annually, this method is used to produce thousands of tons of propanal. Other than that, there are some laboratory methods we can use to make this substance, such as the oxidation of 1-propanol with a mixture of sulfuric acid and potassium dichromate.

丙烷的用途不同，包括其用作三甲基甲烷的先驱（三二），合成几种常见的香气化合物，例如螺旋螺旋体，减少丙醇形成丙醇的丙醇和丙酸的氧化，可提供丙酸等。

What is Iodoform Test

碘型测试是一种重要的分析测试，用于鉴定含有附着在甲基上的羰基碳中心的有机化合物。换句话说，测试标识–c（= o）-CH3中心。该测试中使用的化学反应包括碘，碱和分析物样品，如果未知化合物具有上述化学结构，则可以产生黄色沉淀。此外，这种反应给人以杀菌气味。乙醇分子含有与甲基键合的羰基碳，但在丙烷中没有这种结构，因此我们可以轻松地使用该测试来区分乙醇和丙烷。

How to Distinguish Between Ethanal and Propanal

Ethanal and propanal are aldehyde organic compounds. The best way to distinguish between ethanal and propanal is by performing the iodoform test. Tethanal responds to the iodoform test whereas propanal does not respond to the iodoform test. Moreover, ethanal has an ethereal odor while propanal has a fruity and pungent odor. Ethanal is made by the oxidation of ethylene by Wacker process while propanal is industrially manufactured via hydroformylation of ethylene.

The below infographic tabulates the important differences between both compounds that are helpful to distinguish between ethanal and propanal.

概括– Ethanal vs Propanal

乙醇和丙烷是每个分子具有不同数量的碳原子的醛。区分乙醇和丙烷的最佳方法是进行碘型测试。金纳尔对碘型测试的反应，而丙烷对碘型测试没有反应。

Reference:

1. Helmenstine，Anne Marie。“宿醉和预防。”ThinkCo，2020年8月25日，Available here.

Image Courtesy:

1. “Acetaldehyde-2D-flat” By UAwiki – Own work(CC BY-SA 3.0)viaCommons Wikimedia
2. “Propionaldehyde flat structure” By Cacycle – Own work (Public Domain) viaCommons Wikimedia