Ethanol
Ethanol
Ethanol: Its common name is ethyl alcohol and formula is C2H5OH or CH3CH2OH.
Preparation: Alcohol (ethanol) is obtained by the fermentation of molasses which are obtained from sugarcane juice.
Physical Properties: It is a liquid at room temperature. Its melting point 156 K and boiling point is 351 K. It is soluble in water in all proportions.
Chemical Properties:
a) Reaction with Sodium: Ethyl alcohol reacts win sodium metal leading to the evolution of hydrogen gas alongwith the formation of sodium ethoxide. Hydrogen gas burns with a pop sound.
b) Dehydration: Removal of water molecules from a compound is known as dehydration reaction. When ethanol is heated at 443 K with excess conc. H2SO4, the water molecules get removed from it and ethene is obtained. Thus in this reaction H2SO4 act as dehydrating agent.
Uses of Ethanol:
a) It is used as an active ingredient in all alcoholic drinks.
b) It is useful in medicines like tincture of iodine, cough syrups and many other tonics.
c) Alcohol is used as an additive in petrol, since it is a cleaner fuel and gives rise to only CO2 and H2O when burnt in sufficient air.
Which of the following are correct : (a) Ethanol is the second member of the homologous alcoholic series. (b) Removal of water molecules from a compound is known as dehydration reaction. (c) When ethanol is heated at 443 K with excess conc. H2SO4, the water molecules get removed from it and ethene is obtained. | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following is the second member of the homologous alcoholic series ? | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct : (a) Ethanol common name is ethyl alcohol and formula is C2H5OH or CH3CH2OH. (b) Ethanol is a colourless liquid having a pleasant smell. | |||
| Right Option : C | |||
| View Explanation | |||
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