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(a) How will you bring about the following conversions? Explain by giving suitable chemical equations.

(i) Ethanol to ethanoic acid.

(ii) Ethanol to ethene.

(iii) Ethanol to ethyl ethanoate

(b) Why do unsaturated hydrocarbons burn with a yellow flame?

(c) Why soaps cannot be used in hard water?

 

Or

 

(a)Write IUPAC name the compound CH3COOH and identify its functional group. 

(b)Give the chemical test to identify this compound. Write the chemical equation. 

(c)Name the gas evolved when this compound reacts with solid sodium carbonate. How will you identify this gas?

(d)Would you be able to check if water is hard by using a detergent?

Asked by Topperlearning User 24th July 2017, 3:38 PM
Answered by Expert
Answer:

(a) (i) Ethanol is converted to ethanoic acid by the oxidation of ethanol in the presence of oxidising agent like alkaline potassium permanganate or acidified potassium dichromate.

begin mathsize 12px style straight C subscript 2 straight H subscript 5 OH space space rightwards arrow from left parenthesis or space Alkaline space KMnO subscript 4 space plus space Heat right parenthesis to Acidified space straight K subscript 2 Cr subscript 2 straight O subscript 7 space plus space Heat of space space CH subscript 3 COOH end style

                                             

(ii) Ethanol is converted to ethene by the dehydration of ethanol in the presence of dehydrating agent conc. H2SO4.

begin mathsize 12px style CH subscript 3 CH subscript 2 OH space space rightwards arrow with Hot space conc. space straight H subscript 2 SO subscript 4 on top space space straight H subscript 2 straight C equals CH subscript 2 space plus space straight H subscript 2 straight O end style

                                        

(iii) Ethanol is converted to ethyl ethanoate by the process of esterification i.e. by treating ethanol with ethanoic acid in the presence of conc. H2SO4 and warming it.

begin mathsize 12px style straight C subscript 2 straight H subscript 5 OH space plus space CH subscript 3 COOH space rightwards arrow with Conc. space straight H subscript 2 SO subscript 4 on top space space CH subscript 3 COOC subscript 2 straight H subscript 5 space plus space straight H subscript 2 straight O end style

                             

(b) Unsaturated hydrocarbons burn with a yellow flame because of incomplete combustion. 

(c) Hardness of water is due to the presence of Ca2+ and Mg2+ ions. These ions react with soaps to form curdy white precipitates of calcium and magnesium salts of fatty acids. 

 

Or

 

 

(a)The compound CH3COOH is ethanoic acid.                                 

Its functional group is carboxylic group (-COOH).                             

(b) Ethanoic acid reacts with ethanol in the presence of conc. H2SO4 to form ethyl ethanoate which has a sweet smell.                                             

begin mathsize 12px style straight C subscript 2 straight H subscript 5 OH space plus space CH subscript 3 COOH space rightwards arrow with Conc. space straight H subscript 2 SO subscript 4 on top space CH subscript 3 COOC subscript 2 straight H subscript 5 space plus thin space straight H subscript 2 straight O end style            

(c) Carbon dioxide is evolved when ethanoic acid reacts with solid sodium carbonate. 

When the gas evolved is passed through lime water, it turns lime water milky. This shows that evolved gas is CO2.                                      

 (d) Detergents cannot be used to check whether the water is hard or not because they give a good amount of lather for both hard and soft water.                               

Answered by Expert 24th July 2017, 5:38 PM
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