WORKSHEET 4 CARBON AND ITS COMPOUNDS CBSE BOARD RESULT 100 PERCENT

 CARBON AND ITS COMPOUNDS

Intext Questions

Page 61:

1. What would be the electron dot structure of carbon dioxide which has the formula CO₂?
2. What would be the electron dot structure of a molecule of sulphur, which is made up of eight atoms of sulphur (S₈)?

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Page 68:
3. How many structural isomers can you draw for pentane?
4. What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?
5. What will be the formula and electron dot structure of cyclopentane?
6. Draw the structures for the following compounds:
(a) Ethanoic acid
(b) Bromopentane
(c) Butanone
(d) Hexanal
Are structural isomers possible for bromopentane?

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Page 71:
7. How would you name the following compounds?
(a) CH₃–CH₂–Br
(b)
CH₃
|
CH₃–CH–CH₃
(c) CH₃–CH₂–CH₂–CHO
(d) CH₃–CH₂–CO–CH₃

8. Why is the conversion of ethanol to ethanoic acid an oxidation reaction?
9. A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?

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Page 74:
10. How would you distinguish experimentally between an alcohol and a carboxylic acid?
11. What are oxidising agents?

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Exercise Questions

Page 76-77:

1. Ethane, with the molecular formula C₂H₆, has:
   (a) 6 covalent bonds
   (b) 7 covalent bonds
   (c) 8 covalent bonds
   (d) 9 covalent bonds

2. Butanone is a four-carbon compound with the functional group:
   (a) Carboxylic acid
   (b) Aldehyde
   (c) Ketone
   (d) Alcohol

3. While cooking, if the bottom of the vessel is getting blackened on the outside, it means that:
   (a) The food is not cooked completely.
   (b) The fuel is not burning completely.
   (c) The fuel is wet.
   (d) The fuel is burning completely.

4. Explain the nature of the covalent bond using the bond formation in CH₃Cl.

5. Draw the electron dot structures for:
   (a) Ethanoic acid
   (b) H₂S
   (c) Propanone
   (d) F₂

6. What is a homologous series? Explain with an example.

7. How can ethanol and ethanoic acid be differentiated on the basis of their physical and chemical properties?

8. Why does soap not work in hard water?

9. Draw the structure of the following compounds:
   (a) Ethanoic acid
   (b) Bromopentane
   (c) Butanone
   (d) Hexanal

10. Why are detergents better than soaps for cleaning purposes, even in hard water?

11. Would you be able to check if water is hard using a detergent?

12. People use a variety of methods to wash clothes. Usually after adding soap, they “beat the clothes on a stone” or beat them with a paddle, scrub them with a brush, or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?