This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Alkynes contain how many bonds between two carbon atoms? A) One. B) Two. C) Three. D) Four. Show Answer Correct Answer: C) Three. 2. The product formed in the reaction of toluene with a molecule of chlorine in the presence of FeCl$_{3}$ is A) Benzene chloride. B) O-and p-chlorotoluene. C) Toluene. D) Methylchloride. Show Answer Correct Answer: B) O-and p-chlorotoluene. 3. Which of the following compounds is the correct molecular formula of pentane? A) C5H12. B) CH4. C) C6H14. D) CH3CH2CH2CH2CH2CH3. Show Answer Correct Answer: A) C5H12. 4. What does incomplete combustion produce that complete combustion doesn't? A) Carbon monoxide. B) Water. C) Carbon dioxide. D) None of the above. Show Answer Correct Answer: A) Carbon monoxide. 5. What is carbon monoxide? A) A toxic gas. B) A large solid. C) All the above. D) None of the above. Show Answer Correct Answer: A) A toxic gas. 6. What is the exam definition of saturated? A) No single bonds. B) Contains a double bond. C) No single bonds, all double bonds. D) No double bonds, all single bonds. Show Answer Correct Answer: D) No double bonds, all single bonds. 7. ALKANE, ALKENE or ALKYNE?Decene A) Alkane. B) Alkene. C) Alkyne. D) None of the above. Show Answer Correct Answer: B) Alkene. 8. WHICH of the following is not an isomer of C$_{7}$H$_{16}$ A) 2, 3 dimethyl pentane. B) 2, 2, 3 trimethylbutane. C) 3-isopropyl pentane. D) 3-methylhexane. Show Answer Correct Answer: C) 3-isopropyl pentane. 9. Which of the following is NOT a use of crude oil? A) Fuels for vehicles. B) Feedstock. C) Domestic heating. D) None of the above. Show Answer Correct Answer: C) Domestic heating. 10. Which of the following does not contain only carbon and hydrogen A) Alkanes. B) Alkenes. C) Alkynes. D) Alkanols. Show Answer Correct Answer: D) Alkanols. 11. The alkanes which will have the highest boiling point is ..... A) N-pentane. B) 2-methylbutane. C) 2, 3-dimethylpropane. D) N-hexane. Show Answer Correct Answer: D) N-hexane. 12. What is used to test for saturation/ unsaturation? A) Bromine acid. B) Potassium permanganate. C) Iodine solution. D) Bromine water. Show Answer Correct Answer: D) Bromine water. 13. Is the simplest of alkynes. A) Ethyne. B) Propyn. C) Butyn. D) Pentyne. Show Answer Correct Answer: A) Ethyne. 14. Which rule is applied FIRST when naming hydrocarbons? A) Identify substituents. B) Number the carbon chain. C) Find the longest continuous carbon chain. D) Name the functional group. Show Answer Correct Answer: C) Find the longest continuous carbon chain. 15. What physical property allows Fractional Distillation to separate different fractions of crude oil? A) Melting point. B) Boiling point. C) Diffusion rate. D) Condensation rate. Show Answer Correct Answer: B) Boiling point. 16. Which of the following has the highest viscosity A) Petrol. B) Diesel. C) Biodiesel. D) LPG. Show Answer Correct Answer: C) Biodiesel. 17. What is an isomer? A) Compounds with different molecular formula and same structural formula. B) Compounds with same molecular formula and same structural formula. C) Compounds with same molecular formula and different structural formula. D) Compounds with different molecular formula and different structural formula. Show Answer Correct Answer: C) Compounds with same molecular formula and different structural formula. 18. What type of bonds are present in alkanes? A) Single bonds. B) Double bonds. C) Triple bonds. D) Both double and triple bonds. Show Answer Correct Answer: A) Single bonds. 19. What is the purpose of cracking in the petroleum industry? A) To combine smaller hydrocarbon molecules into larger, less valuable molecules. B) To separate hydrocarbon molecules from impurities. C) To break down larger hydrocarbon molecules into smaller, more valuable molecules. D) To increase the viscosity of petroleum products. Show Answer Correct Answer: C) To break down larger hydrocarbon molecules into smaller, more valuable molecules. 20. What elements make up a hydrocarbon? A) Carbon and hydrogen. B) Hydrogen and oxygen. C) Oxygen and carbon. D) Only carbon. Show Answer Correct Answer: A) Carbon and hydrogen. 21. Alkene + W $\rightarrow$ diol. W could be A) Cold potassium manganite (VII) solution. B) Hot potassium manganite (VII) solution. C) Cold basic potassium manganite (VII) solution. D) Hot acidified potassium manganite (VII) solution. Show Answer Correct Answer: C) Cold basic potassium manganite (VII) solution. 22. Is it possible to form organic compounds from inorganic reactants? A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: A) Yes. 23. As the number of carbons increases the flammability generally ..... A) Increase. B) Decrease. C) Stay the same. D) Varies. Show Answer Correct Answer: B) Decrease. 24. What is required for complete combustion to occur? A) Limited hydrocarbons. B) Unlimited oxygen. C) Unlimited hydrocarbons. D) Limited oxygen. Show Answer Correct Answer: B) Unlimited oxygen. 25. What is the name of the family of hydrocarbons with at least one double bond? A) Alkanes. B) Alkenes. C) Alkynes. D) Cycloalkanes. Show Answer Correct Answer: B) Alkenes. 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