This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Chemistry Part Ii > Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 7 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What does a fuel react with when it burns? A) Carbon dioxide. B) Oxygen. C) Methane. D) Water. Show Answer Correct Answer: B) Oxygen. 2. Why are alkanes non polar? A) The sum of the dipoles in their atoms creates a net dipole. B) They have non polar bonds. C) The dipoles formed by the C-H bonds have a net sum of 0. D) None of the above. Show Answer Correct Answer: C) The dipoles formed by the C-H bonds have a net sum of 0. 3. Organic or Inorganic:Methane $CH_4$ A) Organic. B) Inorganic. C) All the above. D) None of the above. Show Answer Correct Answer: A) Organic. 4. How do covalent bonds contribute to the stability of hydrocarbons? A) Sharing electrons between atoms to create a strong bond. B) Donating electrons to other atoms. C) Causing repulsion between atoms. D) Creating weak bonds between atoms. Show Answer Correct Answer: A) Sharing electrons between atoms to create a strong bond. 5. Is the name of doubled bonded, unsaturated hydrocarbons. A) Alkanes. B) Alkenes. C) Allkynes. D) Tanins. Show Answer Correct Answer: B) Alkenes. 6. One Bond(-) means A) 1 electron. B) 3 electron. C) 1 x 2 e + 1e. D) 2 electron. Show Answer Correct Answer: D) 2 electron. 7. Both ethane and ethene can react with bromine. Choose the FALSE statement. A) Hydrogen bromide gas is released with ethane. B) Ethane reacts by free radical substitution. C) Ethene reacts by addition. D) Ethene can only react in the presence of light. Show Answer Correct Answer: D) Ethene can only react in the presence of light. 8. In benzene sulphonic acid, the sulphonic group is attached with the benzene ring through which element? A) Oxygen. B) Hydrogen. C) Sulphur. D) None of the above. Show Answer Correct Answer: C) Sulphur. 9. Solvent; measuring column in low-temperature thermometers A) Pentane. B) Octane. C) Butane. D) Hexane. Show Answer Correct Answer: A) Pentane. 10. During the process of fractional distillation, the fractions are separated according to the difference in their ..... A) Density. B) Mass. C) Unsaturation. D) Boiling point. Show Answer Correct Answer: D) Boiling point. 11. Name the first three alkanes in the homologous series. A) Methanol, Ethanol, Propanol. B) Butane, Pentane, Hexane. C) Acetylene, Benzene, Toluene. D) Methane, Ethane, Propane. Show Answer Correct Answer: D) Methane, Ethane, Propane. 12. In organic chemistry, hyphens are used to separate ..... A) Numbers from numbers. B) Names from numbers. C) All the above. D) None of the above. Show Answer Correct Answer: B) Names from numbers. 13. What is the general molecular formula of alkenes? A) C$_{n}$H$_{2n}$. B) C$_{n}$H$_{2n+2}$. C) C$_{n}$H$_{2n+3}$. D) C$_{n}$H$_{2n+1}$. Show Answer Correct Answer: A) C$_{n}$H$_{2n}$. 14. Both alkanes and alkenes react rapidly with aqueous bromine at room temperature. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 15. ALKANE, ALKENE or ALKYNE?Pentyne A) Alkane. B) Alkene. C) Alkyne. D) None of the above. Show Answer Correct Answer: C) Alkyne. 16. Ethyl benzene cannot be prepared by A) Wurtz reaction. B) Wurtz-fitig reaction. C) Friedel-crafts reaction. D) Clemmensen reduction. Show Answer Correct Answer: A) Wurtz reaction. 17. Incomplete combustion is when there is a limited amount of oxygen. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 18. Which of the following would have the highest viscosity? A) C$_{4}$H$_{8}$. B) C$_{3}$H$_{8}$. C) C$_{5}$H$_{12}$. D) C$_{22}$H$_{44}$. Show Answer Correct Answer: D) C$_{22}$H$_{44}$. 19. What must methane be combined with to undergo a combustion reaction? A) Carbon dioxide. B) Oxygen. C) Hydrogen. D) Energy. Show Answer Correct Answer: B) Oxygen. 20. In the presence of peroxide, HCl and HI do not give anti-Markovnikov's addition to alkenes because(1) All the steps are exothermic in HCl and HI(2) One of the steps is endothermic in HCl and HI(3) HCl is oxidizing and the HI is reducing(4) Both HCl and HI are strong acids A) 4. B) 3. C) 2. D) 1. Show Answer Correct Answer: C) 2. 21. Hydrocarbon chains should be numbered: A) From left to right. B) From right to right. C) Depending on where the closest double bond is located. D) None of the above. Show Answer Correct Answer: C) Depending on where the closest double bond is located. 22. Which alkane has the LOWEST boiling point? A) Butane. B) Hexane. C) Nonane. D) Octane. Show Answer Correct Answer: A) Butane. 23. 2-ethyl, 3-methylhex-2-ene has how many carbon atoms? A) 8. B) 5. C) 7. D) 6. Show Answer Correct Answer: A) 8. 24. What is the affect of greater branching in alkanes? A) Increases boiling point. B) Decreases boiling point. C) Makes it a saturated hydrocarbon. D) Increases its odor. Show Answer Correct Answer: B) Decreases boiling point. 25. Which of the following shows propagation step A) Cl$^{.}$+CH$_{3}$$^{.}$ CH$_{3}$Cl. B) Cl$^{.}$+ CH$_{4}$ CH$_{3}$$^{.}$+HCl. C) Cl$_{2}$ 2Cl$^{.}$. D) Cl$^{.}$+Cl$^{.}$ Cl$_{2}$. Show Answer Correct Answer: B) Cl$^{.}$+ CH$_{4}$ CH$_{3}$$^{.}$+HCl. 26. The gas liberated by the electrolysis of Dipotassium succinate solution is:(1) Ethyne(2) Ethene(3) Propene(4) Ethane A) 4. B) 1. C) 3. D) 2. Show Answer Correct Answer: D) 2. 27. Which of the following hydrocarbons is also known as acetylene? A) Ethane. B) Ethyne. C) Propane. D) Ethene. Show Answer Correct Answer: B) Ethyne. 28. Another term for enantiomers is: A) Cis-trans isomers. B) Optical isomers. C) Optical illusions. D) Structural isomers. Show Answer Correct Answer: B) Optical isomers. 29. Pentane is an alkane with ..... carbon atoms A) 5. B) 50. C) 15. D) 3. Show Answer Correct Answer: A) 5. 30. What is the result of oxidizing carbon and hydrogen atoms during combustion? A) Carbon monoxide and hydrogen. B) Carbon dioxide and water. C) Hydrogen peroxide. D) Ozone and water. Show Answer Correct Answer: B) Carbon dioxide and water. 31. What type of hydrocarbon is saturated? A) Alkene. B) Alkyne. C) Alkane. D) Aromatic. Show Answer Correct Answer: C) Alkane. 32. Which of the following contains hydrocarbons? A) Plastic Toys. B) Fuel. C) Rubber. D) All of these. Show Answer Correct Answer: D) All of these. 33. As the number of carbons increases the viscosity generally ..... A) Decrease. B) Increase. C) Varies. D) Stay the same. Show Answer Correct Answer: B) Increase. 34. Which of these hydrocarbons would react with bromine water? A) Ethene. B) Cyclopropane. C) Pentane. D) Ethane. Show Answer Correct Answer: A) Ethene. 35. Explain the concept of isomerism in hydrocarbons. A) Isomerism refers to the ability of hydrocarbons to form multiple bonds. B) Isomerism in hydrocarbons is the existence of compounds with the same molecular formula but different structures or arrangements. C) Isomerism is the process of breaking down hydrocarbons into simpler compounds. D) Isomerism in hydrocarbons is the variation in molecular weight among different compounds. Show Answer Correct Answer: B) Isomerism in hydrocarbons is the existence of compounds with the same molecular formula but different structures or arrangements. 36. Maya is studying organic chemistry and wants to know the general formula for alkanes. Can you help her? A) CnH2n. B) C(n-1)H(2n-2). C) C2nH2n. D) CnH(2n+2). Show Answer Correct Answer: D) CnH(2n+2). 37. Which of the following energy sources is incorrectly matched? A) Wind-renewable. B) Oil-nonrenewable. C) Geothermal-nonrenewable. D) Solar-renewable. Show Answer Correct Answer: C) Geothermal-nonrenewable. 38. Branches in a hydrocarbon make up which part of the name? A) Depends on the molecule. B) The suffix. C) The prefix. D) The root. Show Answer Correct Answer: C) The prefix. 39. What can you tell about methane (CH$_{4}$) from its molecular formula? A) It contains one hydrogen atom. B) It contains four carbon atoms. C) It contains four hydrogen atoms. D) It forms groups of four molecules. Show Answer Correct Answer: C) It contains four hydrogen atoms. 40. X is organic compound and can make the color of KMnO$_{4}$ disappear. The molecular formula of X is ..... A) C$_{3}$H$_{8}$. B) C$_{2}$H$_{6}$. C) C$_{4}$H$_{10}$. D) C$_{2}$H$_{4}$. Show Answer Correct Answer: D) C$_{2}$H$_{4}$. 41. Propene + Steam would make? A) Propan-1-ol. B) Propan-2-ol. C) Propan-1-ol and propan-3-ol. D) Propan-1-ol and propan-2-ol. Show Answer Correct Answer: D) Propan-1-ol and propan-2-ol. 42. Which of the following is a toxic gas produced during incomplete combustion that reduces the oxygen-carrying capacity of the blood? A) Oxides of nitrogen. B) Carbon dioxide. C) Carbon monoxide. D) Sulfur dioxide. Show Answer Correct Answer: C) Carbon monoxide. 43. A hydrocarbon that contains a double bonds is also known as ..... ? A) Alkane. B) Unsaturated. C) Wet. D) Saturated. Show Answer Correct Answer: B) Unsaturated. 44. Find the reactants in Friedel-Craft's alkylation A) C$_{6}$H$_{6}$ + CH$_{3}$Cl. B) C$_{6}$H$_{6}$ + CH$_{3}$COCl. C) C$_{6}$H$_{6}$ + NH$_{3}$. D) C$_{6}$H$_{6}$ + CH$_{3}$CO. Show Answer Correct Answer: A) C$_{6}$H$_{6}$ + CH$_{3}$Cl. 45. A hydrocarbon containing double or triple bonds is said to be ..... A) Saturated. B) Unsaturated. C) All the above. D) None of the above. Show Answer Correct Answer: B) Unsaturated. 46. How do you name a cyclic alkane? A) Use 'alkane-' prefix followed by the cyclo name. B) Add 'cyclic-' before the alkane name. C) Name it based on the longest carbon chain only. D) Use 'cyclo-' prefix followed by the alkane name based on carbon count. Show Answer Correct Answer: D) Use 'cyclo-' prefix followed by the alkane name based on carbon count. 47. Which of the following is NOT true of coal usage? A) Coal usage consists of burning coal in order to produce steam in order to move a turbine & generate electricity. B) Coal usage is a completely renewable energy source. C) Coal usage results in 2/3 of the energy "lost" as heat = not efficient. D) None of the above. Show Answer Correct Answer: B) Coal usage is a completely renewable energy source. 48. Why are alkynes used in welding torches? A) They release large amounts of carbon dioxide when burned. B) They produce a hot, intense flame. C) They have high melting points. D) They are highly flammable. Show Answer Correct Answer: B) They produce a hot, intense flame. 49. What is the reactivity of alkynes compared to double bonds? A) Alkynes are less reactive. B) Alkynes are inert. C) Alkynes are equally reactive. D) Alkynes are more reactive. Show Answer Correct Answer: D) Alkynes are more reactive. 50. Which of the following is formed in car engines as the temperature reached is high enough to allow nitrogen and oxygen from air to react? It contributes to acid rain. A) Carbon monoxide. B) Carbon dioxide. C) Oxides of nitrogen. D) Sulfur dioxide. Show Answer Correct Answer: C) Oxides of nitrogen. 51. ..... is the name of hydrocarbons that contain one or more double C=C bonds. A) Alkanes. B) Alkenes. C) Alkynes. D) None of the above. Show Answer Correct Answer: B) Alkenes. 52. Dimethylpentane has how many carbon atoms present? A) 5. B) 7. C) 6. D) 4. Show Answer Correct Answer: B) 7. 53. What does Carbon tetravalence mean? A) Carbon has valence electrons. B) Carbon always forms 4 bonds with its 4 valence electrons. C) Carbon can have up to 4 bonds. D) None of the above. Show Answer Correct Answer: B) Carbon always forms 4 bonds with its 4 valence electrons. 54. What is the first step in balancing a combustion equation? A) Balancing hydrogen atoms. B) Balancing water molecules. C) Balancing oxygen atoms. D) Balancing carbon atoms. Show Answer Correct Answer: D) Balancing carbon atoms. 55. Which of the following alkanes has the name of 2-bromo-1-iodo butane? A) CH$_{3}$ CH$_{}$Br CH$_{2}$ CH$_{2}$I. B) CH$_{2}$Br CH$_{}$I CH$_{2}$ CH$_{3}$. C) CH$_{3}$ CH$_{}$Br CH$_{}$I CH$_{2}$. D) CH$_{2}$I CH$_{}$Br CH$_{2}$ CH$_{3}$. Show Answer Correct Answer: D) CH$_{2}$I CH$_{}$Br CH$_{2}$ CH$_{3}$. 56. Is benzene is toxic or non-toxic? A) Toxic. B) Non-toxic. C) All the above. D) None of the above. Show Answer Correct Answer: A) Toxic. 57. Why do we burn a fuel? A) To lose energy. B) I don't know. C) To release energy. D) To produce carbon dioxide. Show Answer Correct Answer: C) To release energy. 58. What is the simplest hydrocarbon? A) Propane. B) Butane. C) Methane. D) Ethane. Show Answer Correct Answer: C) Methane. 59. Butane is an alkane with A) 3 carbon atoms. B) 4 carbon atoms. C) 5 carbon atoms. D) None of the above. Show Answer Correct Answer: B) 4 carbon atoms. 60. ALKANE, ALKENE or ALKYNE?Decyne A) Alkane. B) Alkene. C) Alkyne. D) None of the above. Show Answer Correct Answer: C) Alkyne. ← PreviousNext →Related QuizzesScience QuizzesClass 11 QuizzesClass 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 1Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 2Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 3Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 4Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 5Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 6Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 8Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books