Saturated and Unsaturated Hydrocarbons - UNSOLVED PRACTICE SET
Chapter: Carbon and Its Compounds | Topic: Saturated and Unsaturated Hydrocarbons
SATURATED AND UNSATURATED HYDROCARBONS - UNSOLVED PRACTICE SET
Topic: Saturated and Unsaturated Hydrocarbons
Multiple Choice Questions
Q1. Which of the following is a saturated hydrocarbon?
- Ethene
- Ethyne
- Propane
- Benzene
Q2. The general formula for alkenes is:
- CₙH₂ₙ₊₂
- CₙH₂ₙ
- CₙH₂ₙ₋₂
- CₙHₙ
Q3. Which hydrocarbon will decolorize bromine water?
- Methane
- Ethane
- Ethene
- Propane
Q4. A hydrocarbon with the formula C₃H₆ belongs to the:
- Alkane series
- Alkene series
- Alkyne series
- Alcohol series
Q5. Which of the following is a characteristic of saturated hydrocarbons?
- They burn with a sooty flame
- They undergo addition reactions
- They have only single bonds between carbon atoms
- They decolorize potassium permanganate solution
Q6. The bond angle in a methane molecule is approximately:
- 90°
- 109.5°
- 120°
- 180°
Short Answer Questions
Q7. Define saturated and unsaturated hydrocarbons. Give one example of each.
Q8. Why do unsaturated hydrocarbons burn with a yellow, sooty flame, while saturated hydrocarbons burn with a blue flame?
Q9. Write the structural formulae of:
(a) Butane (C₄H₁₀)
(b) Butene (C₄H₈)
Q10. What happens when ethene is passed through bromine water? Write the observation and the type of reaction involved.
Q11. Your father uses LPG (liquefied petroleum gas) in the kitchen, which mainly contains propane and butane. Are these saturated or unsaturated? Why is LPG preferred over unsaturated hydrocarbons for cooking?
Q12. Distinguish between alkanes and alkenes on the basis of:
(a) General formula
(b) Type of reaction they undergo
Long Answer Questions
Q13. Explain the difference between saturated and unsaturated hydrocarbons with the help of structural formulae. Why are unsaturated hydrocarbons more reactive than saturated hydrocarbons? Illustrate your answer with the combustion of ethane and ethene.
Q14. Describe an experiment to distinguish between a saturated hydrocarbon and an unsaturated hydrocarbon using bromine water. What would you observe in each case? Write the chemical equation for the reaction that occurs with the unsaturated hydrocarbon.
Q15. In your chemistry lab, you are given two test tubes — one containing hexane (a saturated hydrocarbon) and another containing hexene (an unsaturated hydrocarbon). Your teacher asks you to identify them using chemical tests. Explain:
(a) How would you use bromine water to distinguish them?
(b) How would you use alkaline potassium permanganate solution to distinguish them?
(c) Which test tube would produce more soot when burned, and why?
Numerical / Application-Based Problems
Q16. A hydrocarbon has 3 carbon atoms and 8 hydrogen atoms.
(a) Write its molecular formula.
(b) Identify whether it is saturated or unsaturated. Give a reason.
(c) Draw its electron dot structure.
Q17. An unknown hydrocarbon has the molecular formula C₄H₁₀.
(a) Is it saturated or unsaturated? Justify your answer using the general formula.
(b) Write all possible structural isomers of this compound.
(c) Calculate the ratio of carbon to hydrogen atoms in this compound.
Q18. A student burns 5 g of ethene (C₂H₄) and 5 g of ethane (C₂H₆) separately in two jars.
(a) Which jar will show more soot deposition? Explain.
(b) Calculate the percentage of carbon in ethene. (Atomic masses: C = 12, H = 1)
(c) Why is ethane considered a cleaner fuel than ethene?