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CBSE Class 10 Sample Paper Science Solution - For 2023 Boards

Class 10
Solutions to CBSE Sample Paper - Science Class 10

The formulae of four organic compounds are shown below. Choose the correct option

Question 7 - The formulae of - teachoo.jpg

  1. A and B are unsaturated hydrocarbons
  2. C and D are saturated hydrocarbons
  3. Addition of hydrogen in presence of catalyst changes A to C
  4. Addition of potassium permanganate changes B to D



  • Saturated hydrocarbons are hydrocarbons that only have a single bond between two carbon atoms,
  • Unsaturated hydrocarbons are hydrocarbons with at least one double or triple bond between two carbon atoms.
  • Compound A is ethene
  • The Addition of Hydrogen to a compound in the presence of a catalyst is known as hydrogenation
  • The following reaction will take place when Hydrogenation of compound A takes place.


  • The resultant is Ethane (Compound C) .
  • The addition of potassium permanganate to a hydrocarbon results in its oxidation (to alcohol, aldehyde or carboxylic acid)
  • It does not cause reduction .

Therefore, the correct answer is (c) Addition of hydrogen in presence of catalyst changes A to C

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo