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Note on Alcohol

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Alcohol is defined as an organic compound containing the hydroxyl group (-OH) attached to a saturated carbon atom or a hydrocarbon radical.

Methyl alcohol

Methyl alcohol is the 1st member of monohybrid alcohol. It is prepared in the industrial scale from methane obtained from natural gas.

  • Physical Properties

    1. It is a colorless liquid boiling at 65°C and melting at -98°C
    2. It is miscible with water.
    3. It has a sharp odor and burning taste.
  • Use

    1. It is used for dry cleaning
    2. It is used as an excellent solvent for fats, oils, paints, etc.
    3. It is used as antifreeze for automobile radiation.

      http://i.imgur.com/ggfpl7U.jpg

    4. It is used to make perfumes, paints, and synthetic fabrics.

Ethyl alcohol

  • Molecular formula: C2H5OH
  • Structural formula:

    http://www.rivercitymalone.com/wp-content/uploads/2009/03/ethanol-447x276.jpg

  • Occurrence:

    It is the earliest representative of this class. It is simply called alcohol. It is also called ethanol. It is an important alcohol.

  • Physical properties:

    1. It is a colorless liquid but has a taste.
    2. It is soluble in water.
    3. Its boiling point is 78°C and freezing point is -117°C.
  • Uses:

    1. It is used as an alcoholic beverage.
    2. It is used as a solvent for drugs, oils, perfumes, etc.

      http://i.imgur.com/TxsTrsD.jpg

    3. It is used as a preservative for biological specimens.
    4. It is used as a fluid in the thermometer.

      http://www.exporting-india.co.in/Thermometer 6 Dual Scale.jpg

    5. It is used in the manufacture of polyethene.

  • Alcohol is defined as an organic compound containing the hydroxyl group (-OH) attached to a saturated carbon atom or a hydrocarbon radical.
  • Types of Alcohol: methyl alcohol and ethyl alcohol
  • Methyl alcohol is colorless liquid boiling at 650C
  • Ethyl alcohol is colorless liquid but it has taste.
  • Ethyl alcohol is soluble in water.
  • The boiling point of ethyl alcohol is 780C and freezing point of ethyl alcohol is -1170C.
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Very Short Questions

The following are the uses of ethanol:
i. It is used as solvent for paints, varnishes, fats, oil, etc.
ii. It is used in making dyes, drugs, perfumes and synthetic fibers.
iii. It is used in alcoholic drinks.
iv. It is used in preparation of organic compounds like ether, chloroform and iodoform.
v. It is used in low temperature thermometer.
vi. It is used as an antiseptic to sterilize wounds and syringes in hospitals and dispensaries.

Alcohol is formed from the hydrocarbon when its hydrogen atom is replaced by hydroxyl radical. The hydroxyl derivates of the hydrocarbon are called alcohols.

The two chemical properties of alcohol are as follows:
1) Alcohol burns with blue flame generating a lot of heat.
2) Alcohol react with sodium or potassium to form ethoxide.

Ethyl alcohol and Glycol have two carbon atoms.

In the presence of an enzyme- zymase, the glucose breaks down into ethyl alcohol and carbondioxide.

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  • The valency of copper is ______.

    2 and 3


    1 and 3


    2 and 3


    1 and 2


  • The molecular formula of ______ is  C2H6O?

    propanol
    Ethyl alcohol
    methyl alcohol
    ether
  • The molecular formula for methyl alcohol is ______.

    CH2O


    CH3OH


    CH3O


    C2H5OH


  • Which is used as a preservative for biological specimens?

    Ethyl alcohol


    both ethyl and methyl alcohol


    methyl alcohol


    none of above


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DISCUSSIONS ABOUT THIS NOTE

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Forum Time Replies Report

Ask any queries on this note.skfii


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monohybride alcohol


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swostik shrestha

what is formed by replacing 3atoms of hydrogen by hydroxide?


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