how do alcohols differ structuring from alkanes ? describe the basic steps involved in the preparation of ethanol from sugar.
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Explanation:
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Similar to water, an alcohol can be pictured as having an sp3 hybridized tetrahedral oxygen atom with nonbonding pairs of electrons occupying two of the four sp3 hybrid orbitals. (See chemical bonding for a discussion of hybrid orbitals.) Alkyl groups are generally bulkier than hydrogen atoms, however, so the R―O―H bond angle in alcohols is generally larger than the 104.5° H―O―H bond angle in water. For example, the 108.9° bond angle in methanol shows the effect of the methyl group, which is larger than the hydrogen atom of water.
One way of classifying alcohols is based on which carbon atom is bonded to the hydroxyl group. If this carbon is primary (1°, bonded to only one other carbon atom), 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. Similarly, a tertiary alcohol has the hydroxyl group on a tertiary (3°) carbon atom, which is bonded to three other carbons. Alcohols are referred to as allylic or benzylic if the hydroxyl group is bonded to an allylic carbon atom (adjacent to a C=C double bond) or a benzylic carbon atom (next to a benzene ring), respectively.
As with other types of organic compounds, alcohols are named by both formal and common systems. The most generally applicable system is that adopted at a meeting of the International Union of Pure and Applied Chemistry (IUPAC) in Paris in 1957. Using the IUPAC system, the name for an alcohol uses the -ol suffix with the name of the parent alkane, together with a number to give the location of the hydroxyl group. The rules are summarized in a three-step procedure:
Name the longest carbon chain that contains the carbon atom bearing the ―OH group. Drop the final -e from the alkane name, and add the suffix -ol.
Number the longest carbon chain starting at the end nearest the ―OH group, and use the appropriate number, if necessary, to indicate the position of the ―OH group.
Name the substituents, and give their numbers as for an alkane or alkene.
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Ethanol (also called ethyl alcohol, grain alcohol, drinking alcohol, spirits, or simply alcohol) is an organic chemical compound. It is a simple alcohol with the chemical formula C
2H
6O. Its formula can be also written as CH
3−CH
2−OH or C
2H
5OH (an ethyl group linked to a hydroxyl group), and is often abbreviated as EtOH. Ethanol is a volatile, flammable, colorless liquid with a slight characteristic odor. It is a psychoactive substance, recreational drug, and the active ingredient in alcoholic drinks.Chemical formulaEdit
Ethanol is a 2-carbon alcohol. Its molecular formula is CH3CH2OH. An alternative notation is CH3−CH2−OH, which indicates that the carbon of a methyl group (CH3−) is attached to the carbon of a methylene group (−CH2–), which is attached to the oxygen of a hydroxyl group (−OH). It is a constitutional isomer of dimethyl ether. Ethanol is sometimes abbreviated as EtOH, using the common organic chemistry notation of representing the ethyl group (C2H5−) with Et.
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