Vivian Marlowe
Alcohol is a type of organic compound that carries at least one hydroxyl group (OH) attached to a carbon atom. The hydroxyl group replaces a hydrogen atom in the compound's hydrocarbon chain. Alcohols can be classified into primary, secondary, and tertiary alcohols, depending on the number of carbon atoms attached to the carbon atom bearing the hydroxyl group. The general formula for a primary alcohol is RCH2OH, for a secondary alcohol is R2CHOH, and for a tertiary alcohol is R3COH. Alcohols can be produced by hydroxylation, the installation of a hydroxy group using oxygen or a related oxidant. The presence of an OH group gives alcohols unique properties and reactivity, and they are commonly used in various applications, including as sweeteners, in perfumes, and for sterilizing hospital instruments.
| Characteristics | Values |
|---|---|
| Number of oxygen atoms | 1 |
| Oxygen atom structure | sp3 hybridized tetrahedral with nonbonding pairs of electrons occupying two of the four sp3 hybrid orbitals |
| Hydroxyl group | -OH |
| Hydroxyl group attachment | Carbon atom |
| Hydroxyl group attachment type | Covalent bond |
| General formula | R—OH, where R represents the hydrocarbon (alkane) portion of the molecule |
| IUPAC nomenclature suffix | -ol |
| IUPAC nomenclature guidelines | Name the longest carbon chain that contains the carbon atom bearing the -OH group |
| Classification | Primary (1°), Secondary (2°), Tertiary (3°) |
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What You'll Learn
Alcohols are organic compounds with a hydroxyl (-OH) group
The most common naming system for alcohols is the one adopted by the International Union of Pure and Applied Chemistry (IUPAC) in 1957. This system uses the suffix '-ol' with the name of the parent alkane, along with a number to indicate the location of the hydroxyl group. For example, ethanol (CH3CH2OH) gets its name from the alkane chain name "ethane," with the terminal "e" replaced by the '-ol' suffix. The position of the hydroxyl group is indicated by a number between the alkane name and the suffix, as in "2-chloro-3-methyl-3-hexanol."
Alcohols can be classified based on which carbon atom is bonded to the hydroxyl group. If the carbon atom is primary (1°), it is bonded to only one other carbon atom, and the compound is a primary alcohol. A secondary alcohol has the hydroxyl group on a secondary (2°) carbon atom, which is bonded to two other carbon atoms. A tertiary (3°) alcohol has the hydroxyl group on a carbon atom bonded to three other carbon atoms.
Alcohols are among the most common organic compounds and are used in various applications, including as sweeteners, in perfumes, and in the synthesis of other compounds. They are also found in nature, such as in cholesterol and carbohydrates. Ethanol, for example, is the alcohol found in alcoholic beverages, but it is also used in toiletries, pharmaceuticals, and fuels, as well as for sterilizing hospital instruments.
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Methanol is the simplest alcohol
Alcohols are organic compounds characterised by one or more hydroxyl (―OH) groups attached to a carbon atom of an alkyl group. They can be considered organic derivatives of water (H2O) in which one of the hydrogen atoms has been replaced by an alkyl group. The general formula for alcohols is ROH, where R is an alkyl group.
Methanol, also known as methyl alcohol and wood spirit, is an organic chemical compound and the simplest aliphatic alcohol, with the chemical formula CH3OH. It is a light, volatile, colourless, and flammable liquid with a distinctive alcoholic odour similar to that of ethanol (potable alcohol). However, it is more toxic than ethanol.
Methanol consists of a methyl group (CH3) linked to a hydroxy or hydroxyl group (OH). Its chemical formula, CH3OH, reflects this structure. The name "methanol" comes from the combination of "methylène," derived from the Greek "methy" meaning "alcoholic liquid," and "hȳlē" meaning "forest, wood, timber, material." This name was introduced by French chemists Jean-Baptiste Dumas and Eugene Peligot in 1834.
Methanol was historically produced by the destructive distillation of wood, and it was once known as "wood alcohol." Today, it is mainly produced industrially by hydrogenation of carbon monoxide. It has a variety of applications, including its use as a solvent, a denaturant for ethanol, and a fuel in camping stoves and direct-methanol fuel cells. However, it is highly toxic, and ingestion of even small amounts can cause permanent blindness or death.
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Ethanol is the alcohol in alcoholic drinks
Alcoholic drinks are considered "empty-calorie foods" as they contribute no essential nutrients. However, alcohol is a significant source of food energy for individuals with alcoholism and those who binge drink. Alcohol is a central nervous system (CNS) depressant, decreasing electrical activity in the neurons of the brain, which causes the characteristic effects of alcohol intoxication. Ethanol, or ethyl alcohol, is the alcohol found in alcoholic drinks. It is made when yeast ferments the sugars in grains, fruits, and vegetables. For example, wine is made from the sugar in grapes, and vodka is distilled from the sugar in potatoes. Ethanol can also be prepared from ethylene or made by fermentation.
Ethanol is commonly consumed as a recreational substance in the form of alcoholic beverages such as beer, wine, and spirits. It is the active ingredient in these drinks and is also used in toiletries, pharmaceuticals, and fuels. It is used to sterilize hospital instruments and is an ingredient in mouthwash and hand sanitizers. The alcohol content in mouthwash can be as high as 27%, and hand sanitizers are recommended to have at least 60% alcohol content to be effective against germs.
Ethanol has an -OH group and only 2 carbon atoms. Its chemical formula is CH3CH2OH. The -OH group is attached to an aliphatic carbon atom. The IUPAC nomenclature guidelines use the suffix '-ol' to denote simple compounds that contain alcohols. The general formula for alcohols is ROH, where R is an alkyl group.
Ethanol consumption can lead to dire consequences. Drinking too much ethanol can lead to ethanol poisoning, and consuming ethanol-containing beverages can cause alcohol flush reactions, exacerbate rhinitis, and, in some cases, bronchoconstriction in patients with a history of asthma. Ethanol can be used to treat methanol or ethylene glycol poisoning. However, it is important to note that ethanol is addictive and can result in alcohol use disorder, dependence, and withdrawal upon cessation.
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Alcohol is classified into primary, secondary and tertiary types
Alcohols are organic compounds characterised by one or more hydroxyl (―OH) groups attached to a carbon atom of an alkyl group (hydrocarbon chain). They are classified as primary, secondary, or tertiary alcohols, depending on the number of alkyl or aryl groups bonded to the carbon atom attached to the hydroxyl group. This carbon atom is sometimes known as the carbinol carbon.
Primary alcohols are those where the carbon atom of the hydroxyl group is attached to only one single alkyl group. Examples of primary alcohols include ethanol, propanol, butanol, and methanol. The general formula for primary alcohols is RCH2OH.
Secondary alcohols are those where the carbon atom of the hydroxyl group is attached to two alkyl groups on either side. The two alkyl groups may be either structurally identical or different. The general formula for secondary alcohols is R2CHOH.
Tertiary alcohols feature a hydroxyl group attached to the carbon atom, which is connected to three alkyl groups. The general formula for tertiary alcohols is R3COH. Alcohols containing two OH groups on adjacent carbon atoms are called glycols.
The Lucas test is used to distinguish between primary, secondary, and tertiary alcohols by testing their reactivity with Lucas reagent.
While not a type of alcohol, it is worth noting that methanol (CH3OH) is distinct from the "primary, secondary, tertiary" naming convention.
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Alcohol is an organic derivative of water (H2O)
Alcohols are organic compounds that contain one or more hydroxyl (―OH) groups attached to a carbon atom of an alkyl group (hydrocarbon chain). They are organic derivatives of water (H2O) in which one of the hydrogen atoms has been replaced by an alkyl group, typically represented by R in organic structures.
The simplest alcohol, methanol (CH3OH), also known as methyl alcohol or wood alcohol, is derived from methane by putting an OH group in place of one of the H groups. Methanol can be obtained by heating wood without air, a process known as destructive distillation. Ethanol (CH3CH2OH), or ethyl alcohol, is another simple alcohol that is commonly used in toiletries, pharmaceuticals, fuels, and alcoholic beverages. It is produced by some species of yeast found in wine, beer, and distilled drinks, and it makes up 3 to 6 percent of beer, 12 to 15 percent of most wines, and 49 to 59 percent of distilled liquor.
The presence of the OH group in alcohols strongly modifies the properties of hydrocarbons, making them hydrophilic (water-loving). This OH group also provides a site for many reactions to occur. For example, primary alcohols can be oxidised to form aldehydes or carboxylic acids, while secondary alcohols are oxidised to ketones. Tertiary alcohols, on the other hand, are not easily oxidised.
Alcohols can be classified as primary, secondary, or tertiary based on the number of carbon atoms connected to the carbon atom bearing the hydroxyl group. The general formula for primary alcohols is RCH2OH, while secondary alcohols have the formula R2CHOH, and tertiary alcohols have the formula R3COH.
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Frequently asked questions
Alcohol has one oxygen atom.
The simplest form of alcohol is methanol (CH3OH), also known as methyl alcohol or wood alcohol.
The general formula for an alcohol is R—OH, where R represents the hydrocarbon (alkane) portion of the molecule, also known as an alkyl group.
Examples of alcohol include ethanol, methanol, 1-hexanol, 1-butanol, and 2-propanol.
