Beginner Topic 792 of 1102 Organic Chemistry
Alcohols
Compounds with an OH group bonded to saturated carbon, classified as primary, secondary or tertiary.
In-depth explanation of Alcohols
Alcohols are compounds of the form R-OH, in which an OH group is bonded to a saturated carbon. They are classified as primary, secondary or tertiary according to the number of carbon atoms attached to the carbon bearing the OH group, which controls their oxidation and reaction behaviour. The O-H bond makes alcohols polar and allows them to form hydrogen bonds, and they are weakly acidic with a pKa of about 16 to 18. The alcohol can act as a nucleophile, as an acid, or as a substrate once the OH is converted into a good leaving group.
Going deeper: Alcohols
Key ideas: Classified as primary, secondary or tertiary by the carbon bearing OH. Methods: hydration of alkenes, reduction of carbonyls (NaBH4, LiAlH4), Grignard addition to carbonyls (formaldehyde gives primary, other aldehydes secondary, ketones tertiary), SN2 hydrolysis of halides. Reactions: oxidation, esterification, dehydration, conversion to halides, reaction with Na giving H2 and alkoxide.
Common mistakes and connections: Students forget that Grignard with esters gives tertiary alcohols with two identical groups added. Another error is believing alcohols are strongly acidic; pKa is about 16, similar to water. Links to the Lucas test, oxidation levels, ethers via Williamson synthesis and hydrogen bonding.
Visualization of Alcohols
Methanol is the simplest alcohol: a methyl group bonded to a polar O-H group that can hydrogen bond. The interactive lesson shows this as a live animation or chart.
Worked example and use case
Methanol is highly toxic, while ethanol is the alcohol present in alcoholic beverages.
Frequently asked questions about Alcohols
What is Alcohols?
Compounds with an OH group bonded to saturated carbon, classified as primary, secondary or tertiary.
Is Alcohols a beginner, intermediate or advanced topic?
Alcohols is a beginner topic in Organic Chemistry. It needs no earlier chemistry lessons and is a good starting point.
What should I learn before Alcohols?
Study these earlier topics in Organic Chemistry first: E1 Elimination, E2 Elimination, Zaitsev's Rule.
What comes after Alcohols?
The next topics in Organic Chemistry are Properties of Alcohols and Oxidation of Alcohols.
Can I practise Alcohols with quizzes?
Yes. The interactive lesson includes a self-check question on Alcohols, and the Organic Chemistry quiz draws on every topic in this area.
Where Alcohols fits in Organic Chemistry
Alcohols is topic 64 of 148 in Organic Chemistry.