This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Chemistry Part Ii > Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 8 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Isomers are molecules that have the ..... molecular formula, have ..... structures and ..... functions. A) Different, different, different. B) Different, same, different. C) Same, same, same. D) Same, different, different. Show Answer Correct Answer: D) Same, different, different. 2. The colour of bromine water in ethene is ..... A) Brown. B) Pink. C) White. D) Colourless. Show Answer Correct Answer: D) Colourless. 3. As the number of carbon atoms in a formula ..... , the number of possible isomers ..... A) Increases, decreases. B) Increases, increases. C) Decreases, increases. D) None of the above. Show Answer Correct Answer: B) Increases, increases. 4. If a hydrocarbon had 3 triple bonds, what would the suffix be? A) "-triyne". B) "-diyne". C) "-triene". D) "-yne". Show Answer Correct Answer: A) "-triyne". 5. What is the chemical formula of an alkane that has 1 carbon atom? A) C1H3. B) C1H2. C) C1H4. D) C1H6. Show Answer Correct Answer: C) C1H4. 6. The overlapping of orbitals in benzene is of the type A) Sp-sp. B) Sp2-sp2. C) Sp3-sp3. D) None of the above. Show Answer Correct Answer: B) Sp2-sp2. 7. A group of compounds forms ..... if there is a constant increment of change in molecular structure from one compound in the series to the next. A) A heterologous series. B) A decrement series. C) A homologous series. D) None of the above. Show Answer Correct Answer: C) A homologous series. 8. What are the types of combustion? A) Complete & incomplete. B) Incomplete & inexact. C) Impossible & complete. D) Computer & incompete. Show Answer Correct Answer: A) Complete & incomplete. 9. If there was an ethyl and a methyl branch in a hydrocarbon, which one would come first in the name? A) The root. B) Ethyl. C) Methyl. D) The suffix. Show Answer Correct Answer: B) Ethyl. 10. What is the general formula for hydrocarbons with single bonds? A) CnHn+2. B) CnH2n-2. C) CnH2n+2. D) CnH2n. Show Answer Correct Answer: C) CnH2n+2. 11. The word equation for complete combustion is:fuel + oxygen $\rightarrow$ water + ..... A) Limewater. B) Carbon. C) Carbon dioxide. D) Carbon monoxide. Show Answer Correct Answer: C) Carbon dioxide. 12. What is the name of C$_{5}$H$_{12}$? A) Heptane. B) Hexane. C) Butane. D) Pentane. Show Answer Correct Answer: D) Pentane. 13. When this equation is balanced:C$_{5}$H$_{12}$ + O$_{2}$(g) $\rightarrow$ CO$_{2}$(g) + H$_{2}$O(l)The summation of all coefficients are ..... A) 18. B) 21. C) 19. D) 20. Show Answer Correct Answer: D) 20. 14. Which ONE of the following compounds has the LOWEST melting point? A) Octane. B) Butane. C) Ethane. D) Hexane. Show Answer Correct Answer: C) Ethane. 15. Major component of materials used in certain motor fuels and dry-cleaning solvents A) Butane. B) Octane. C) Pentane. D) Hexane. Show Answer Correct Answer: D) Hexane. 16. What are hydrocarbon fuels made of? A) Hydrogen and carbon. B) Helium and carbon. C) Hydrogen and calcium. D) Helium and calcium. Show Answer Correct Answer: A) Hydrogen and carbon. 17. Aliphatic hydrocarbons are nonpolar compounds A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 18. What are the environmental impacts of hydrocarbon combustion? A) The environmental impacts of hydrocarbon combustion include greenhouse gas emissions, air pollution, and potential ecological damage from extraction processes. B) Hydrocarbon combustion is a renewable energy source. C) It only affects water quality, not air quality. D) Hydrocarbon combustion has no impact on the environment. Show Answer Correct Answer: A) The environmental impacts of hydrocarbon combustion include greenhouse gas emissions, air pollution, and potential ecological damage from extraction processes. 19. Why is the combustion of hydrocarbons so useful in our society? A) Recycles hydrocarbons. B) Produces energy. C) Produces water. D) Produces carbon dioxide. Show Answer Correct Answer: B) Produces energy. 20. Bottled gas for home heating, portable stoves and heaters; refrigerant A) Methane. B) Propane. C) Isobutane. D) Butane. Show Answer Correct Answer: B) Propane. 21. When naming hydrocarbons, we number the carbons so that the position numbers are ..... A) Depends on the compound. B) Left to right. C) The highest possible. D) The lowest possible. Show Answer Correct Answer: D) The lowest possible. 22. The molecular formula below which shown the alkanes compound is ..... A) C$_{4}$H$_{10}$. B) C$_{2}$H$_{4}$. C) C$_{3}$H$_{7}$. D) C$_{5}$H$_{8}$. Show Answer Correct Answer: A) C$_{4}$H$_{10}$. 23. Explain the concept of covalent bonds in hydrocarbons. A) Covalent bonds in hydrocarbons are formed when two atoms share a pair of electrons, resulting in the formation of a stable molecule. B) Covalent bonds in hydrocarbons are formed by the transfer of electrons between atoms. C) Covalent bonds in hydrocarbons are formed by the sharing of protons between atoms. D) Covalent bonds in hydrocarbons are formed by the attraction of opposite charges. Show Answer Correct Answer: A) Covalent bonds in hydrocarbons are formed when two atoms share a pair of electrons, resulting in the formation of a stable molecule. 24. A compound having molecular formula C$_{5}$H$_{12}$ is an ..... A) Alkene. B) Alkyne. C) Alkane. D) None of these. Show Answer Correct Answer: C) Alkane. 25. The root name "meth-" represents a chain of how many C atoms? A) 4. B) 3. C) 1. D) 2. Show Answer Correct Answer: C) 1. 26. What is wrong with the name 1-methyl-3-cyclohexene A) Prefixes. B) Numbering. C) Dashes. D) Commas. Show Answer Correct Answer: B) Numbering. 27. Which of the following best explains why PbS + PbSO$_{4}$ ==> 2Pb + 2SO$_{2}$ is not a combustion reaction? A) Fuel is not a reactant. B) Molecular oxygen is not a product. C) Fuel is not a product. D) Molecular oxygen is not a reactant. Show Answer Correct Answer: D) Molecular oxygen is not a reactant. 28. Heptane contains the following number of carbons: A) 4. B) 9. C) 7. D) 3. Show Answer Correct Answer: C) 7. 29. X + NaOH ..... $^{CaO}$ ..... benzenewhat is X A) Sodium phenoxide. B) Chlorobenzene. C) Sodium benzoate. D) Sodium propanoate. Show Answer Correct Answer: C) Sodium benzoate. 30. What do we call compounds with the same chemical formula but different structural formulas? A) Isomers. B) Functional groups. C) Ions. D) Metals. Show Answer Correct Answer: A) Isomers. 31. Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of:-(1) an isopropyl group(2) an acetylenic triple bond(3) two ethylenic double bonds(4) a vinyl group A) 1. B) 3. C) 4. D) 2. Show Answer Correct Answer: B) 3. 32. How many isomers does pentane have? A) 3. B) 2. C) 5. D) 9. Show Answer Correct Answer: C) 5. 33. Which of the following statements concerning the reaction of methane with bromine is/are correct?(1) It is an addition reaction.(2) It is a substitution reaction.(3) A similar reaction will occur if propane is used instead of methane. A) Only. B) Only. C) And (3) only. D) And (3) only. Show Answer Correct Answer: C) And (3) only. 34. What is the name of the family of hydrocarbons with at least one triple bond? A) Alkanes. B) Alkynes. C) Cycloalkanes. D) Alkenes. Show Answer Correct Answer: B) Alkynes. 35. ALKANE, ALKENE or ALKYNE?Nonene A) Alkane. B) Alkene. C) Alkyne. D) None of the above. Show Answer Correct Answer: B) Alkene. 36. How many bonds can be found in hydrocarbons that are unsaturated? A) Single bonds and Quadruple bonds. B) Double bonds ONLY. C) Triple bonds and Double bonds. D) Aromatic. Show Answer Correct Answer: C) Triple bonds and Double bonds. 37. What property of hydrocarbons decreases as the molecule size increases? A) Boiling point. B) Flammability. C) Combustibility. D) Viscosity. Show Answer Correct Answer: B) Flammability. 38. Mutu dan kualitas bensin dipengaruhi oleh faktor, kecuali? A) Bilangan Oktan bensin. B) Bentuk struktur senyawa bensin. C) Campuran bensin. D) Proses Distilasi. Show Answer Correct Answer: D) Proses Distilasi. 39. What are hydrocarbons made of? A) Hydrogen and oxygen. B) Carbon and hydrogen. C) Carbon and nitrogen. D) Hydrogen and sulfur. Show Answer Correct Answer: B) Carbon and hydrogen. 40. Is the simplest of the alkanes. A) Ethane. B) Buthane. C) Propane. D) Methane. Show Answer Correct Answer: D) Methane. 41. Acetylene is the nonsynstematic name for the simplest ..... A) Alkane. B) Alkene. C) Alkyne. D) None of the above. Show Answer Correct Answer: C) Alkyne. 42. As the number of carbons increases in an homologous series the melting point generally ..... A) Stay the same. B) Decrease. C) Varies. D) Increase. Show Answer Correct Answer: D) Increase. 43. Polysubstitution is a major drawback in(a) Reimer-Tiemann reaction(b) Friedel-Crafts acylation(c) Friedel-Crafts alkylation(d) Acetylation of aniline. A) 3. B) 2. C) 4. D) 1. Show Answer Correct Answer: A) 3. 44. What colour flame is produced in complete combustion? A) Blue. B) Yellow. C) Green. D) None of the above. Show Answer Correct Answer: A) Blue. 45. Does CH$_{4}$ have hydrogen bonding? A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: B) No. 46. Which of the following is formed during the combustion of some impurities in hydrocarbon fuels? This gas contributes to acid rain. A) Oxides of nitrogen. B) Carbon dioxide. C) Sulfur dioxide. D) Carbon monoxide. Show Answer Correct Answer: C) Sulfur dioxide. 47. One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is:-(1) Ethene(2) Propene(3) 1-Butene(4) 2-Butene A) 2. B) 1. C) 4. D) 3. Show Answer Correct Answer: C) 4. 48. Hydrocarbons are used in ..... A) Fuels. B) Candles. C) Plastic. D) All of these. Show Answer Correct Answer: D) All of these. 49. How many carbon atoms are in a molecule of hexene? A) 3. B) 6. C) 4. D) 5. Show Answer Correct Answer: B) 6. 50. Give an example of an unsaturated hydrocarbon. A) Methane. B) Butane. C) Propane. D) Ethene. Show Answer Correct Answer: D) Ethene. 51. What name is given to the reaction when you add chlorine across a double bond? A) Hydrogenation. B) Addition. C) Polymerisation. D) Hydration. Show Answer Correct Answer: B) Addition. 52. Hydrocarbon that contains at least one carbon-carbon double covalent bond. A) Alkane. B) Alkene. C) Alkyne. D) None of the above. Show Answer Correct Answer: B) Alkene. 53. Identify the main characteristics of an organic compoung A) Low melting point. B) Nonpolar. C) Non-conductor. D) All of the above. Show Answer Correct Answer: D) All of the above. 54. What is the formula of propyne? A) C3H8. B) C3H6. C) C3H4. D) C3H3. Show Answer Correct Answer: C) C3H4. 55. The simplest member of organic compound is? A) Methane. B) Formaldehyde. C) Methanol. D) Formic acid. Show Answer Correct Answer: A) Methane. 56. Which pair has the same molecular formula but different structural formulas? A) Ethane and ethene. B) Propane and propene. C) But-1-ene and but-2-ene. D) Ethene and ethyne. Show Answer Correct Answer: C) But-1-ene and but-2-ene. 57. Alkanes have the general formula: A) CnH2n+1. B) CnH2n+2. C) CnH2n. D) CnHn. Show Answer Correct Answer: B) CnH2n+2. 58. The boiling and melting points are ..... than those corresponding to aliphatic hydrocarbons.Are compounds that are ..... in water. A) Higher, soluble. B) Lower, insoluble. C) Lower, soluble. D) Higher, insoluble. Show Answer Correct Answer: D) Higher, insoluble. 59. What are the hydrogens in a hydrocarbon bonded to? A) Other hydrogens. B) A central carbon skeleton. C) All the above. D) None of the above. Show Answer Correct Answer: B) A central carbon skeleton. 60. By using Saytzeff's rule, the most stable alkene is A) C$_{2}$H$_{5}$CH=CHC$_{2}$H$_{5}$. B) CH$_{2=}$CHC$_{4}$H$_{9}$. C) (C$_{2}$H$_{5}$)$_{2}$C=CH$_{2}$. D) (CH$_{3}$)$_{2}$C=C(CH$_{3}$)$_{2}$. Show Answer Correct Answer: D) (CH$_{3}$)$_{2}$C=C(CH$_{3}$)$_{2}$. ← 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 7Class 11 Chemistry (Part Ii) Chapter 13 Hydrocarbons Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books