Hydrocarbons Quiz - CBSE Class 11 Science

Free practice quiz: Hydrocarbons (CBSE Class 11 Science). 18 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is an alkane?

   1. C₂H₄
   2. C₂H₂
   3. C₃H₈
   4. C₆H₆
   Show answer

   Answer: C. C₃H₈

   Alkanes have the general formula CₙH₂ₙ₊₂, where n is the number of carbon atoms. C₃H₈ (propane) fits this formula.

2. What type of hybridization is present in ethene (C₂H₄)?

   1. sp
   2. sp²
   3. sp³
   4. None of the above
   Show answer

   Answer: B. sp²

   Ethene has a double bond, requiring sp² hybridization to form three sigma bonds and one pi bond.

3. What is isomerism?

   1. Compounds with different molecular formulas but the same structural formula
   2. Compounds with the same molecular formula but different structural formulas
   3. Compounds with the same physical properties
   4. Compounds with the same chemical properties
   Show answer

   Answer: B. Compounds with the same molecular formula but different structural formulas

   Isomers have the same molecular formula but different arrangements of atoms.

4. What is the IUPAC name for CH₃CH=CHCH₃?

   1. 1-butene
   2. 2-butene
   3. 1-butyne
   4. 2-butyne
   Show answer

   Answer: B. 2-butene

   The double bond is on the second carbon atom, making it 2-butene.

5. Explain the mechanism of free radical halogenation of alkanes.

   1. Initiation, propagation, termination
   2. Addition, elimination
   3. Substitution
   4. Rearrangement
   Show answer

   Answer: A. Initiation, propagation, termination

   Free radical halogenation involves three steps: initiation, propagation, and termination.

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