This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Chemistry Part Ii > Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 5 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Due to its cyclic structure with a surrounding cloud of delocalised electrons, benzene is accurately described by which of the following chemical adjectives? A) Pungent. B) Odorous. C) Smelly. D) Aromaticity. Show Answer Correct Answer: D) Aromaticity. 2. Which formula shows the way in which atoms are bonded in a molecule but does not show all the bond lines? A) Structural formula. B) Molecular formula. C) Condensed structural formula. D) Empirical formula. Show Answer Correct Answer: C) Condensed structural formula. 3. The alkanes below which form as gas in room temperature is ..... A) C$_{4}$H$_{10}$. B) C$_{5}$H$_{12}$. C) C$_{20}$H$_{42}$. D) C$_{10}$H$_{22}$. Show Answer Correct Answer: A) C$_{4}$H$_{10}$. 4. What type of hydrocarbon contains only single bonds and the most hydrogens for a given number of C-atoms? A) Aromatic hydrocarbon. B) Alkene. C) Alkyne. D) Alkane. Show Answer Correct Answer: D) Alkane. 5. What is a functional group in chemistry?(Not a definition, just outline of concept) A) A group of atoms that determines the physical and chemical properties of compounds. B) A group of atoms that appears in all chemical families. C) A group of reactive atoms bonded together. D) A group of atoms that appears in all hydrocarbons. Show Answer Correct Answer: B) A group of atoms that appears in all chemical families. 6. Which of the following molecules would have the lowest boiling point? A) C$_{2}$H$_{6}$. B) CH$_{4}$. C) C$_{4}$H$_{10}$. D) C$_{3}$H$_{8}$. Show Answer Correct Answer: B) CH$_{4}$. 7. Identify the hydrocarbon:C$_{5}$H$_{10}$. A) Propene. B) Butene. C) Hexane. D) Pentene. Show Answer Correct Answer: D) Pentene. 8. The conditions which are required for combustion to take place are: A) Fuel. B) Heat. C) Oxygen. D) All of these. Show Answer Correct Answer: D) All of these. 9. What type of bond is formed between carbon and hydrogen in hydrocarbons? A) Metallic bond. B) Single covalent bond. C) Double covalent bond. D) Ionic bond. Show Answer Correct Answer: B) Single covalent bond. 10. Which of the following is not a side effect of an incomplete combustion reaction? A) Production of poisonous gas. B) Reduces the ability of red blood cells to carry oxygen. C) Release of carbon monoxide that causes suffocation. D) Increase the ability of red blood cells to carry oxygen. Show Answer Correct Answer: D) Increase the ability of red blood cells to carry oxygen. 11. Which of the following is a type of combustion that occurs when there is plenty of oxygen; it produces carbon dioxide and water vapour only? A) Oxidation. B) Incomplete combustion. C) Burning. D) Complete combustion. Show Answer Correct Answer: D) Complete combustion. 12. ..... is the name of hydrocarbons that contain one or more carbon-carbon triple bonds. A) Alkanes. B) Alkenes. C) Alkynes. D) None of the above. Show Answer Correct Answer: C) Alkynes. 13. Explain the principle behind fractional distillation. A) Different hydrocarbons have different boiling points. B) Different hydrocarbons have the same boiling point. C) Fractional distillation is used to combine different substances. D) Fractional distillation separates substances based on color. Show Answer Correct Answer: A) Different hydrocarbons have different boiling points. 14. Which of the followings is not an application of alkanes? A) Used as refrigrent. B) Used as solvent. C) Used as oxidizer. D) Used as fuel. Show Answer Correct Answer: C) Used as oxidizer. 15. ALKANE, ALKENE or ALKYNE?Methane A) Alkane. B) Alkene. C) Alkyne. D) None of the above. Show Answer Correct Answer: A) Alkane. 16. What is the bond angle in the eclipsed conformation of C2H6? A) 90. B) 60. C) 0. D) 120. Show Answer Correct Answer: B) 60. 17. Butane contains the following number of carbons: A) 7. B) 9. C) 3. D) 4. Show Answer Correct Answer: D) 4. 18. Which of the following is a property of hydrocarbons? A) Hydrocarbons contain only oxygen and nitrogen. B) Hydrocarbons are generally nonpolar and hydrophobic. C) Hydrocarbons are soluble in water. D) Hydrocarbons are always polar and hydrophilic. Show Answer Correct Answer: B) Hydrocarbons are generally nonpolar and hydrophobic. 19. Which substance has the weakest intermolecular forces? A) Substance A, boiling point of 75 $^\circ$C. B) Substance B, boiling point of 105 $^\circ$C. C) Substance d, boiling point of 45 $^\circ$C. D) Substance C, boiling point of 25 $^\circ$C. Show Answer Correct Answer: D) Substance C, boiling point of 25 $^\circ$C. 20. What is the IUPAC name for a compound with the formula C4H10? A) Butane. B) Propane. C) Pentane. D) Isobutane. Show Answer Correct Answer: A) Butane. 21. Who first discovered benzene? A) Faraday. B) Einstein. C) Mendeleev. D) Edison. Show Answer Correct Answer: A) Faraday. 22. How many moles of water can be produced when 1 mol of heptane is burnt in air? A) 8. B) 6. C) 5. D) 7. Show Answer Correct Answer: A) 8. 23. Name the first three alkanes and their IUPAC names. A) Hexane (C6). B) Methane (C1), Ethane (C2), Propane (C3). C) Pentane (C5). D) Butane (C4). Show Answer Correct Answer: B) Methane (C1), Ethane (C2), Propane (C3). 24. Electrophilic Addition involves ..... A) The subtraction of a nucleophile to an alkene. B) The addition of a nucleophile to an alkane. C) The addition of a electrophile to an alkene. D) The addition of a electrophile to an alkane. Show Answer Correct Answer: C) The addition of a electrophile to an alkene. 25. ALKENES ARE KNOWN AS ..... A) SATURATED. B) UNSATURATED. C) All the above. D) None of the above. Show Answer Correct Answer: B) UNSATURATED. 26. Which is the "Wonder Element" ? A) Hydrogen. B) Boron. C) Butanol. D) Carbon. Show Answer Correct Answer: D) Carbon. 27. Product when sodium butanoate undergoes kolbe electrolysis A) Butane. B) Octane. C) Hexane. D) Propane. Show Answer Correct Answer: C) Hexane. 28. What is the name for organic molecules that contain a hydroxyl group? A) Alcohols. B) Hydrols. C) Carbols. D) Groupols. Show Answer Correct Answer: A) Alcohols. 29. Halogenation of alkane proceed via which type of mechanism? A) Free radical formation. B) Transition state. C) Carbocation formation. D) Carbanion formation. Show Answer Correct Answer: A) Free radical formation. 30. Why do straight-chain alkanes have higher boiling points than branched alkanes? A) Greater polarity. B) Greater surface area for stronger London dispersion forces. C) More Carbon atoms. D) Stronger covalent bonds. Show Answer Correct Answer: B) Greater surface area for stronger London dispersion forces. 31. If a hydrocarbon has a double bond, what would the suffix be? A) "-ane". B) "-benzene". C) "-ene". D) "-yne". Show Answer Correct Answer: C) "-ene". 32. What is wrong with the name 1 methyl 3 cyclo-hexene A) Commas. B) Numbering. C) Dashes. D) Prefixes. Show Answer Correct Answer: C) Dashes. 33. C$_{4}$H$_{10 }$is an example of a ..... A) Molecular formula. B) Full structural formula. C) Shortened structural formula. D) Ball-and-stick model. Show Answer Correct Answer: A) Molecular formula. 34. What is the molecular formula of a methyl functional group? A) CH2. B) CH3. C) CH5. D) C2H5. Show Answer Correct Answer: B) CH3. 35. Which of the following is NOT a use for an alcohol? A) Solvent. B) Alcoholic drinks. C) Flavourings. D) Fuels. Show Answer Correct Answer: C) Flavourings. 36. The difference between each member in a homologous series is ..... A) CH. B) C2H2. C) CH3. D) CH2. Show Answer Correct Answer: D) CH2. 37. In hydrocarbon nomenclature, a number next to a number should be separated with a: A) Blank space. B) Comma. C) Hyphen. D) None of the above. Show Answer Correct Answer: B) Comma. 38. As the number of carbons increases in an alkane the melting point generally ..... A) Decreases. B) Varies. C) Increases. D) Stay the same. Show Answer Correct Answer: C) Increases. 39. Physical state of benzene: A) Solid. B) Plasma. C) Gaseous. D) Liquid. Show Answer Correct Answer: D) Liquid. 40. What type of hydrocarbon has a triple bond? A) Alkyne. B) Alkene. C) Aromatic. D) Alkane. Show Answer Correct Answer: A) Alkyne. 41. Choose the correct statement for fused bicyclic. A) Fused rings share three adjacent carbon atoms but do not share the bond between them. B) Fused rings share three adjacent carbon atoms and the bond between them. C) Fused rings share two adjacent carbon atoms and the bond between them. D) None of the above. Show Answer Correct Answer: C) Fused rings share two adjacent carbon atoms and the bond between them. 42. What do you call a bond where one atom donates an electron to another atom? A) Electrostatic. B) Covalent. C) Iconic. D) Ionic. Show Answer Correct Answer: D) Ionic. 43. How many double bonds in the benzene molecule? A) 1. B) 4. C) 2. D) 3. Show Answer Correct Answer: D) 3. 44. Identify an isomer of but-2-ene A) But-1-ene. B) But-3-ene. C) Butane. D) Cyclopropane. Show Answer Correct Answer: A) But-1-ene. 45. A compound that contains only carbon and hydrogen and that produces carbon dioxide and water when burned is called a(n) A) Ionic compound. B) Binary compound. C) Hydrocarbon. D) Carbonate. Show Answer Correct Answer: C) Hydrocarbon. 46. How many carbons are in the backbone (longest chain) of this organic compound:2, 2-dimethylhexane A) 2. B) 1. C) 7. D) 6. Show Answer Correct Answer: D) 6. 47. Which of the following alkene reaction follows Markovnokv's rule? A) CH$_{2}$ = CH$_{2}$ + Br$_{2}$ $\rightarrow$ Br-CH$_{2}$-CH$_{2}$-Br. B) CH$_{2}$ = CH$_{2}$ + H$_{2}$ $\rightarrow$ CH$_{3}$-CH$_{3}$. C) CH$_{2}$ = CH$_{2}$ + H$_{2}$O $\rightarrow$ OH-CH$_{2}$-CH$_{3}$. D) CH$_{2}$ = CH$_{}$-CH$_{3}$+ H$_{}$Cl $\rightarrow$ CH$_{3}$-CH$_{}$Cl-CH$_{3}$. Show Answer Correct Answer: D) CH$_{2}$ = CH$_{}$-CH$_{3}$+ H$_{}$Cl $\rightarrow$ CH$_{3}$-CH$_{}$Cl-CH$_{3}$. 48. Hydrocarbons, the simplest family of carbon compounds, are made from these two elements: A) Hydrogen and Copper. B) Helium and Carbon. C) Hydrogen and Carbon. D) None of the above. Show Answer Correct Answer: C) Hydrogen and Carbon. 49. How many Hydrogen atoms are needed in an alkyne that has 2 carbon atoms? A) 4. B) 6. C) 8. D) 2. Show Answer Correct Answer: D) 2. 50. Which structural formula has the highest of the boiling point? A) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{3}$. B) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$CH$_{3}$. C) CH$_{3}$CH$_{2}$CH$_{3}$. D) CH$_{3}$CH$_{3}$. Show Answer Correct Answer: B) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$CH$_{3}$. 51. What is the name of the hydrocarbon with the molecular formula C4H10? A) Ethanol. B) Propane. C) Butane. D) Methane. Show Answer Correct Answer: C) Butane. 52. Which of the following is true about structural isomers? A) Have the same molecular formula. B) Have different physical and chemical properties. C) Have the same number of elements. D) All of the above. Show Answer Correct Answer: D) All of the above. 53. Which of the following is a combustion reaction? A) 2AgNO$_{3}$ + H$_{2}$S $\rightarrow$ Ag$_{2}$S + 2NHO$_{3}$. B) 2Al + N$_{2}$ $\rightarrow$ 2AlN$_{4}$. C) 2H$_{2}$O $\rightarrow$ 2H$_{2}$ + O$_{2}$. D) 4Fe + 3O$_{2}$ $\rightarrow$ 2Fe$_{2}$O$_{3}$. Show Answer Correct Answer: D) 4Fe + 3O$_{2}$ $\rightarrow$ 2Fe$_{2}$O$_{3}$. 54. ALKANE, ALKENE or ALKYNE?Butene A) Alkane. B) Alkene. C) Alkyne. D) None of the above. Show Answer Correct Answer: B) Alkene. 55. Which of the following is a characteristic of alkynes? A) They are generally highly reactive. B) They have a triple bond between carbon atoms. C) They are saturated hydrocarbons. D) They do not undergo addition reactions. Show Answer Correct Answer: B) They have a triple bond between carbon atoms. 56. Arenes do not show ..... A) Electrophilic additions. B) Greater stability. C) Resonance. D) Delocalization of pi-electrons. Show Answer Correct Answer: A) Electrophilic additions. 57. What would you make if you added Hydrogen to Ethene? A) 1, 2-dihydroethane. B) Ethane. C) Propane. D) Ethanol. Show Answer Correct Answer: B) Ethane. 58. Major part of natural gas; raw material for many synthetic products A) Butane. B) Ethane. C) Methane. D) Propane. Show Answer Correct Answer: C) Methane. 59. Ozonolysis is a reaction used to break the C=C double bond in alkenes. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: B) True. 60. Formula of ethene is A) C$_{2}$H. B) C$_{2}$H$_{4}$. C) CH$_{3}$. D) C$_{4}$H$_{12}$. Show Answer Correct Answer: B) C$_{2}$H$_{4}$. ← 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 6Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 7Class 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