NCERT Class X Science Solutions: Chapter 4 – Carbon and Its Compounds Part 1 (For CBSE, ICSE, IAS, NET, NRA 2023)

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Question 1:

Ethane, with the molecular formula has

  1. 6 covalent bonds.
  2. 7 covalent bonds.
  3. 8 covalent bonds.
  4. 9 covalent bonds.


B. Ethane has 7 covalent bonds.

Question 2:

Butanone is a four-carbon compound with the functional group

  1. Carboxylic acid.
  2. Aldehyde.
  3. Ketone.
  4. Alcohol.


C. The functional group of butanone is ketone.

Question 3:

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that

  1. The food is not cooked completely.
  2. The fuel is not burning completely.
  3. The fuel is wet.
  4. The fuel is burning completely.


B. While cooking, if the bottom of the vessel is getting blackened on the outside, then it means that the fuel is not burning completely. Science

Question 4:

Explain the nature of the covalent bond using the bond formation in


Carbon can neither lose four of its electrons nor gain four electrons as both the processes require extra amount of energy and would make the system unstable. Therefore, it completes its octet by sharing its four electrons with other carbon atoms or with atoms of other elements. The bonds that are formed by sharing electrons are known as covalent bonds. In covalent bonding, both the atoms share the valence electrons, i.e.. , the shared electrons belong to the valence shells of both the atoms. Here, carbon requires 4 electrons to complete its octet, while each hydrogen atom requires one electron to complete its duplet. Also, chlorine requires an electron to complete the octet. Therefore, all of these share the electrons and as a result, carbon forms 3 bonds with hydrogen and one with chlorine.

Image Result for Methyl Chloride

Question 5:

Draw the electron dot structures for

  1. Ethanoic acid.
  2. H2S.
  3. Propane.
  4. F2.


  1. Ethanoic acid
Image Result for Ethanoic Acid
  1. H2S
Image Result for H2S
  1. Propane
Image Result for Propanone
  1. F2
As Showing in Images is a Fluorine