Class 10 Chemistry



Carbon and Its Compounds

NCERT In Text Solution

Question: 1. What would be the electron dot structure of carbon dioxide which has the formula CO2?

Answer:

lewis dot structure carbon dioxide

Question: 2. What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur? (Hint – The eight atoms of sulphur are joined together in the form of a ring.)

Answer:

lewis dot structure sulphur

Question: 3. How many structural isomers can you draw for pentane?

Answer: Pentane has three structural isomers. These are n-pentane, Iso-pentane and neo-pentane. Structures of all the three isomers are given here.

structural isomers of pentane structural isomers of pentane structural isomers of pentane

Question: 4. What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?
Answer: Carbon can form huge number of carbon compounds because of the following properties:

  • Catenation: Carbon can form bond with other carbon atoms. This property is called catenation. Because of catenation, carbon can form long chains, branched chains and closed chains.
  • Carbon can form compounds with elements of many other elements.

Question: 5. What will be the formula and electron dot structure of cyclopentane?

Answer: Formula of cyclopentane is C5H10

lewis dot structure cyclopentane

Question: 6. Draw the structures for the following compounds.

  1. Ethanoic acid
  2. Bromopentane*
  3. Butanone
  4. Hexanal

Answer:

(i) Ethanoic acid

structural formula ethanoic acid

(ii) Bromopentane

structurral formula bromopentane

(iii) Butanone

structural formula butaone

(iv) Hexanal

structural formula hexanal

Question: 7. Are structural isomers possible for bromopentane?

Answer:Yes, isomer of bromopentane is possible. Structure of one of the isomers of bromopentane is given above.