This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part Ii > Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the primary use of chloramphenicol? A) Treatment of malaria. B) As an anesthetic. C) As a solvent. D) Treatment of typhoid fever. Show Answer Correct Answer: D) Treatment of typhoid fever. 2. How can alkyl halides be prepared from alcohols? A) Addition reaction with a hydrogen halide in the presence of a Lewis acid catalyst. B) Oxidation reaction with a halogen gas. C) Substitution reaction with a hydrogen halide in the presence of a Lewis acid catalyst. D) Direct combination of alcohol and halogen gas. Show Answer Correct Answer: C) Substitution reaction with a hydrogen halide in the presence of a Lewis acid catalyst. 3. The gas formed when iodoform reacts with silver powder A) Acetylene. B) Ethene. C) Propene. D) None of the above. Show Answer Correct Answer: A) Acetylene. 4. Which is the correct IUPAC name for CH3-CH(C2H5)-CH2-Br? A) 2-Methyl-1-bromobutane. B) 1-Bromo-2-ethylpropane. C) 1-Bromo-2-ethyl-2-methylethane. D) 1-Bromo-2-methylbutane. Show Answer Correct Answer: D) 1-Bromo-2-methylbutane. 5. Which reagent is commonly used in electrophilic aromatic substitution reactions? A) Electrophiles such as bromine (Br2) with a Lewis acid catalyst. B) Reducing agents like lithium aluminum hydride (LiAlH4). C) Nucleophiles like sodium hydroxide (NaOH). D) Oxidizing agents such as potassium permanganate (KMnO4). Show Answer Correct Answer: A) Electrophiles such as bromine (Br2) with a Lewis acid catalyst. 6. What type of hybridization is present in the carbon atom bonded to the halogen in haloarenes? A) Sp2. B) Sp3. C) Sp3d. D) Sp. Show Answer Correct Answer: A) Sp2. 7. The halogenation of alkanes gives alkyl halide which are A) Chain isomers. B) Positional isomers. C) Functional isomers. D) Metamers. Show Answer Correct Answer: B) Positional isomers. 8. What is the general formula for haloalkanes? A) CnH2n-1X. B) CnH2n+2X. C) CnH2n+1X. D) CnH2nX. Show Answer Correct Answer: C) CnH2n+1X. 9. What is the purpose of using a Lewis acid catalyst in electrophilic substitution reactions? A) To neutralize the electrophile before it reacts with the aromatic ring. B) To decrease the reactivity of the electrophile towards the aromatic ring. C) To increase the reactivity of the electrophile towards the aromatic ring. D) To inhibit the reaction between the electrophile and the aromatic ring. Show Answer Correct Answer: C) To increase the reactivity of the electrophile towards the aromatic ring. 10. Which type of reaction is favored for tertiary haloalkanes when treated with a strong nucleophile? A) Elimination reaction. B) All of the above. C) SN2 reaction. D) SN1 reaction. Show Answer Correct Answer: D) SN1 reaction. 11. Assertion:Haloalkanes can be converted to alkenes through elimination reactions. Reason:This process involves the removal of a halogen and a hydrogen atom. A) Elimination reactions do not involve any atoms being removed. B) This process adds a halogen and a hydrogen atom. C) Haloalkanes cannot be converted to alkenes. D) True. Show Answer Correct Answer: D) True. 12. Which of the following is most reactive towards SN1 reaction? A) C$_{6}$H$_{5}$CH$_{2}$Br. B) C$_{6}$H$_{5}$CH(CH$_{3}$)Br. C) C$_{6}$H$_{5}$CH(C$_{6}$H$_{5}$)Br. D) C$_{6}$H$_{5}$C(CH$_{3}$)C$_{6}$H$_{5}$Br. Show Answer Correct Answer: D) C$_{6}$H$_{5}$C(CH$_{3}$)C$_{6}$H$_{5}$Br. 13. What is formed when hydrogen atoms in hydrocarbons are replaced by halogen atoms? A) Amines and amides. B) Alcohols and ethers. C) Alkyl halides and aryl halides. D) Alkenes and alkynes. Show Answer Correct Answer: C) Alkyl halides and aryl halides. 14. Assertion:The reaction of haloalkanes with sodium hydroxide leads to the formation of alcohols. Reason:This reaction is an example of nucleophilic substitution. A) The assertion is false, but the reason is true. B) Both assertion and reason are true, and the reason correctly explains the assertion. C) Both assertion and reason are false, and the reason does not explain the assertion. D) The assertion is true, but the reason is false. Show Answer Correct Answer: B) Both assertion and reason are true, and the reason correctly explains the assertion. 15. . Which is the correct increasing order of boiling points of the following compounds? A) Bromobenzene < 1-Bromobutane < 1-Bromopropane < 1-Bromoethane. B) 1-Bromopropane < 1-Bromobutane < 1-Bromoethane < Bromobenzene. C) 1-Bromoethane < 1-Bromopropane < 1-Bromobutane < Bromobenzene. D) Bromobenzene < 1-Bromoethane < 1-Bromopropane < 1-Bromobutane. Show Answer Correct Answer: C) 1-Bromoethane < 1-Bromopropane < 1-Bromobutane < Bromobenzene. 16. The most reactive alkyl halide is: A) R-Br. B) R-F. C) R-I. D) R-Cl. Show Answer Correct Answer: C) R-I. 17. Which of the following statements regarding the S$_{N}$1 reaction shown by alkyl halide is not correct? A) The S$_{N}$1 reaction involves the inversion of configuration of the optically active subtract. B) The S$_{N}$1 reaction on the chiral starting material ends up with racemization of the product. C) The more stable the carbocation intermediate the faster the S$_{N}$1 reaction. D) The added nucleophile plays no kinetic role in S$_{N}$1 reaction. Show Answer Correct Answer: A) The S$_{N}$1 reaction involves the inversion of configuration of the optically active subtract. 18. S$_{N}$2 stand for A) Bimolecular nucleophilic substitution. B) Unimolecular nucleophilic substitution. C) All the above. D) None of the above. Show Answer Correct Answer: A) Bimolecular nucleophilic substitution. 19. Which of the following reactions does not proceed through a carbocation intermediate? A) SN2. B) SN1. C) Rearrangement reaction. D) Elimination (E1). Show Answer Correct Answer: A) SN2. 20. If Tollen's reagent is added to a compound and it forms a silver mirror, what functional group is present? A) Alcohol. B) Aldehyde. C) Carboxylic acid. D) Ketone. Show Answer Correct Answer: B) Aldehyde. 21. What are the physical properties of haloarenes compared to alkanes? A) Haloarenes have higher boiling/melting points, lower volatility, and higher density compared to alkanes. B) Haloarenes are more volatile than alkanes. C) Haloarenes have lower density compared to alkanes. D) Haloarenes have lower boiling/melting points than alkanes. Show Answer Correct Answer: A) Haloarenes have higher boiling/melting points, lower volatility, and higher density compared to alkanes. 22. Haloform reaction does not take place in A) Propan2-ol. B) Propan-2-one. C) Ethanol. D) 2-chlorobutane. Show Answer Correct Answer: D) 2-chlorobutane. 23. The IUPAC name of CH$_{3 }$CH$_{2}$ CH$_{2}$ CH$_{2}$ Br is A) Bromobutane. B) Bromopropane. C) Bromopentane. D) Bromoethane. Show Answer Correct Answer: A) Bromobutane. 24. Which type of reactions are haloalkanes more reactive towards? A) E1/E2. B) SN1/SN2. C) Polymerization. D) Addition. Show Answer Correct Answer: B) SN1/SN2. 25. Which of the following compounds is considered a potential blood substitute? A) Chloroquine. B) Thyroxine. C) Chloramphenicol. D) Fluorinated compounds. Show Answer Correct Answer: D) Fluorinated compounds. 26. The position of-Br in the compound CH$_{3}$CH=CH(Br)(CH$_{3}$)$_{2}$ can be classified as ..... A) Allyl. B) Aryl. C) Vinyl. D) Secondary. Show Answer Correct Answer: A) Allyl. 27. Name one industrial application of haloalkanes. A) Fuels for combustion engines. B) Raw materials for plastics. C) Refrigerants in cooling systems. D) Solvents in industrial applications. Show Answer Correct Answer: D) Solvents in industrial applications. 28. The synthesis of alkyl fluoride is best accomplished by A) Finkelstein reaction. B) Swartz reaction. C) Free radical fluorination. D) Sandmeyers reaction. Show Answer Correct Answer: B) Swartz reaction. 29. Bromination of methane in presence of sunlight is A) Nucleophilic addition. B) Free radical substitution. C) Electrophilic substitution. D) Nucleophilic substitution. Show Answer Correct Answer: B) Free radical substitution. 30. What factors influence the reactivity of haloalkanes? A) The molecular weight of the solvent. B) The color of the haloalkane. C) The temperature of the reaction. D) The reactivity of haloalkanes is influenced by the halogen atom, the type of carbon atom, steric hindrance, and the solvent. Show Answer Correct Answer: D) The reactivity of haloalkanes is influenced by the halogen atom, the type of carbon atom, steric hindrance, and the solvent. 31. Assertion:The stability of the carbocation intermediate affects the rate of electrophilic substitution in haloarenes. Reason:More stable carbocations lead to faster reactions. A) True. B) Electrophilic substitution does not involve carbocations. C) Carbocation stability has no effect on reaction rate. D) Less stable carbocations react faster than stable ones. Show Answer Correct Answer: A) True. 32. Name the compound:C6H5Br A) Bromophenol. B) BenzeneBromide. C) PhenylBromide. D) Bromobenzene. Show Answer Correct Answer: D) Bromobenzene. 33. What is the effect of resonance on the C-X bond in haloarenes? A) Decreases polarity. B) Increases polarity. C) Increases reactivity. D) No effect. Show Answer Correct Answer: A) Decreases polarity. 34. The alkyl halide is converted into an alcohol by A) Substitution. B) Addition. C) Elimination. D) Dehydrohalogenation. Show Answer Correct Answer: A) Substitution. 35. What is the role of halogenated compounds in ozone depletion? A) Halogenated compounds are used to repair ozone damage. B) Halogenated compounds have no effect on ozone levels. C) Halogenated compounds contribute to ozone depletion by releasing chlorine that destroys ozone molecules. D) Halogenated compounds enhance ozone formation by releasing oxygen. Show Answer Correct Answer: C) Halogenated compounds contribute to ozone depletion by releasing chlorine that destroys ozone molecules. 36. Which type of nucleophilic substitution reaction involves a carbocation intermediate? A) None. B) Both. C) S N 2 reactions. D) S N 1 reactions. Show Answer Correct Answer: D) S N 1 reactions. 37. The increasing order of nucleophilicity would be A) I$^{-}$< Br$^{-}$ < Cl$^{-}$. B) I$^{-}$< Cl$^{-}$< Br$^{-}$. C) Cl-< Br$^{-}$ < I$^{-}$. D) Br$^{-}$ < Cl$^{-}$ < F$^{-}$. Show Answer Correct Answer: C) Cl-< Br$^{-}$ < I$^{-}$. 38. Which of the following is not correctly matched with its IUPAC name? A) O-BrC$_{6}$H$_{4}$CH(CH)$_{3}$CH$_{2}$CH$_{3}$:2-Bromo-1-methylpropylbenzane. B) CH$_{3}$C(p-ClC$_{6}$H$_{4}$)$_{2}$CH(Br)CH$_{3}$:2-Bromo-3, 3-bis(4-chlorophenyl)butane. C) (CCl$_{3}$)$_{3}$CCl:2-(Trichloromethyl)-1, 1, 1, 2, 3, 3, 3-heptachloropropane. D) CHF$_{2}$CBrClF:1-bromo-1-chloro-1, 2, 2-trifluoroethane. Show Answer Correct Answer: A) O-BrC$_{6}$H$_{4}$CH(CH)$_{3}$CH$_{2}$CH$_{3}$:2-Bromo-1-methylpropylbenzane. 39. How does the presence of multiple halogen atoms affect the reactivity of haloalkanes? A) Multiple halogen atoms make haloalkanes less stable and more inert. B) The presence of halogen atoms has no effect on the reactivity of haloalkanes. C) Multiple halogen atoms increase the reactivity of haloalkanes by enhancing electrophilicity and stabilizing transition states. D) Multiple halogen atoms decrease the reactivity of haloalkanes by reducing electrophilicity. Show Answer Correct Answer: C) Multiple halogen atoms increase the reactivity of haloalkanes by enhancing electrophilicity and stabilizing transition states. 40. Which reagent will you use for the following reaction? CH$_{3}$CH$_{2}$CH$_{2}$CH$_{3}$ $\rightarrow$ CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$Cl + CH$_{3}$CH$_{2}$CHClCH$_{3}$ A) NaCl + H$_{2}$SO$_{4 }$. B) Cl$_{2}$ gas in dark. C) Cl$_{2 }$gas in the presence of iron in dark. D) Cl$_{2}$ /UV light. Show Answer Correct Answer: D) Cl$_{2}$ /UV light. 41. Ethylene dichloride and ethylidene chloride are isomeric compounds. The false statement about these isomers is that they A) Contain the same percentage of chlorine. B) Are position isomers. C) React with alcoholic potash and give the same product. D) Are both hydrolysed to the same product. Show Answer Correct Answer: D) Are both hydrolysed to the same product. 42. What is the primary environmental concern associated with chlorofluorocarbons (CFCs)? A) Ozone layer depletion. B) Global warming. C) Water pollution. D) Soil degradation. Show Answer Correct Answer: A) Ozone layer depletion. 43. What is the main difference between S N 1 and S N 2 reactions in terms of mechanism? A) Neither involve a carbocation intermediate. B) Both involve a carbocation intermediate. C) S N 2 involves a carbocation intermediate, while S N 1 does not. D) S N 1 involves a carbocation intermediate, while S N 2 does not. Show Answer Correct Answer: D) S N 1 involves a carbocation intermediate, while S N 2 does not. 44. Name the compound:C6H5F A) Fluorobenzene. B) Fluoromethane. C) Hexafluorobenzene. D) Benzene fluoride. Show Answer Correct Answer: A) Fluorobenzene. 45. What is the environmental impact of using haloalkanes? A) Haloalkanes are used to enhance air quality. B) Haloalkanes have no significant impact on climate change. C) Haloalkanes have negative environmental impacts, including ozone depletion, bioaccumulation, and greenhouse gas emissions. D) Haloalkanes promote biodiversity and ecosystem health. Show Answer Correct Answer: C) Haloalkanes have negative environmental impacts, including ozone depletion, bioaccumulation, and greenhouse gas emissions. 46. Cyanide ion acts as an ambident nucleophile. From which end its acts as a stronger nucleophile in aqueous medium? A) It has same strength from both the ends. B) It acts as a stronger nucleophile from carbon end. C) It depends on the nature of the alkyl halide. D) It acts as a stronger nucleophile from nitrogen end. Show Answer Correct Answer: B) It acts as a stronger nucleophile from carbon end. 47. The geminal dihalide contains halogen bonded to A) Different carbon atom. B) Same carbon atom. C) Adjacent carbon atom. D) All the above. Show Answer Correct Answer: B) Same carbon atom. 48. What is the main characteristic of electrophilic aromatic substitution? A) The rearrangement of the aromatic ring structure. B) The substitution of a hydrogen atom on an aromatic ring with an electrophile. C) The addition of a nucleophile to an aromatic ring. D) The removal of an electrophile from an aromatic compound. Show Answer Correct Answer: B) The substitution of a hydrogen atom on an aromatic ring with an electrophile. 49. What is the primary reason for the higher boiling points of haloalkanes compared to alkanes? A) Haloalkanes have higher molecular weights. B) Haloalkanes have stronger hydrogen bonds. C) Haloalkanes are more volatile than alkanes. D) Haloalkanes exhibit dipole-dipole interactions due to the presence of halogens. Show Answer Correct Answer: D) Haloalkanes exhibit dipole-dipole interactions due to the presence of halogens. 50. Which of the following compounds on reaction with chloroform and alcoholic potash gives carbylamine A) Primary amine. B) Secondary amine. C) Tertiary amine. D) None of the above. Show Answer Correct Answer: A) Primary amine. 51. What is the major product formed when benzene undergoes electrophilic substitution with bromine? A) Bromobenzene. B) Iodobenzene. C) Fluorobenzene. D) Chlorobenzene. Show Answer Correct Answer: A) Bromobenzene. 52. Which of the following statements about haloarenes is correct? A) They are more reactive than alkyl halides. B) They cannot undergo nucleophilic substitution reactions. C) They are easily hydrolyzed in water. D) They undergo electrophilic substitution more easily than haloalkanes. Show Answer Correct Answer: B) They cannot undergo nucleophilic substitution reactions. 53. Which compound is used as antiseptic? A) Iodoform. B) CHI3. C) Ethanol. D) All of these. Show Answer Correct Answer: D) All of these. 54. Methyl bromide on reaction with sodium gives A) Ethane. B) Methane. C) Propane. D) None of the above. Show Answer Correct Answer: A) Ethane. 55. Why aryl halides are not much prone to nucleophilic substitution reaction? A) C-Cl bond is more polarised. B) C-Cl bond is stable due to resonance. C) C-Cl bond acquires a partial double bond character due to resonance of pi electrons. D) C-Cl bond length is more ( 177 pm ) in aryl halides. Show Answer Correct Answer: C) C-Cl bond acquires a partial double bond character due to resonance of pi electrons. 56. Describe the electrophilic substitution reaction of benzene with chlorine. A) Nucleophilic substitution reaction of benzene with chlorine. B) Radical substitution reaction of benzene with chlorine. C) Electrophilic substitution reaction of benzene with chlorine involves the replacement of a hydrogen atom on the benzene ring by a chlorine atom. D) Electrophilic addition reaction of benzene with chlorine. Show Answer Correct Answer: C) Electrophilic substitution reaction of benzene with chlorine involves the replacement of a hydrogen atom on the benzene ring by a chlorine atom. 57. Assertion:KCN React with methyl chloride to give methyl isocyanideReason:CN-is an ambident nucleophile A) (A) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of the Assertion (A). B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). C) Assertion (A) is true, but Reason (R) is false. D) Assertion (A) is false, but Reason (R) is true. Show Answer Correct Answer: D) Assertion (A) is false, but Reason (R) is true. 58. Assertion:KCN reacts with methyl chloride to give methyl isocyanide.Reason:CN-is an ambident nucleophile. A) Assertion and reason both are correct and reason is correct explanation of assertion. B) Assertion and reason both are wrong statements. C) Assertion is correct but reason is wrong statement. D) Assertion is wrong but reason is correct statement. E) Assertion and reason both are correct statements but reason is not correct explanation of assertion. Show Answer Correct Answer: D) Assertion is wrong but reason is correct statement. 59. Assertion:Haloarenes can undergo electrophilic substitution reactions. Reason:The presence of halogen atoms activates the aromatic ring towards electrophiles. A) The presence of halogen atoms deactivates the aromatic ring towards electrophiles. B) Haloarenes cannot undergo electrophilic substitution reactions. C) False. D) True. Show Answer Correct Answer: C) False. 60. What is the significance of the term 'persistent organic pollutants' (POPs) in relation to haloarenes? A) Haloarenes are significant as persistent organic pollutants (POPs) due to their stability, bioaccumulation, and toxicity. B) Haloarenes are biodegradable and non-toxic. C) Haloarenes are primarily found in natural water sources. D) Haloarenes are used as effective pesticides. Show Answer Correct Answer: A) Haloarenes are significant as persistent organic pollutants (POPs) due to their stability, bioaccumulation, and toxicity. ← PreviousNext →Related QuizzesScience QuizzesClass 12 QuizzesClass 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 1Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 2Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 3Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 5Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 6Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 7Class 12 Chemistry (Part Ii) Chapter 11 Alcohols QuizClass 12 Chemistry (Part Ii) Chapter 12 Aldehydes Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books