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 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 5 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The IUPAC name of tertiary butyl chloride is A) 1, 2-cholro-3-bromobutane. B) 4-cholorobutane. C) 2-choloro-2-methyl propane. D) 3-chlorobutane. Show Answer Correct Answer: C) 2-choloro-2-methyl propane. 2. Which reagent is most preferable for preparation of haloalkanes? A) NaBr + H$_{2}$SO$_{4}$. B) Red PX$_{2}$( x$_{2}$ = br$_{2}$, Cl$_{2}$). C) Thionyl chloride. D) ZnCl2 + HCl. Show Answer Correct Answer: C) Thionyl chloride. 3. The compound C6H5F is an example of a ..... halide. A) Allylic. B) Benzylic. C) Aryl. D) Vinylic. Show Answer Correct Answer: C) Aryl. 4. What is the outcome of S N 2 reactions in terms of stereochemistry? A) Inversion. B) No change. C) Retention. D) Racemization. Show Answer Correct Answer: A) Inversion. 5. The product formed when phenol reacts with chloroform and caustic soda is A) Salicylaldehyde. B) Benzoic acid. C) Salicylic acid. D) None of the above. Show Answer Correct Answer: A) Salicylaldehyde. 6. What type of reactions are haloalkanes susceptible to due to their polar nature? A) Addition reactions. B) Nucleophilic substitution and elimination reactions. C) Oxidation reactions. D) Polymerization reactions. Show Answer Correct Answer: B) Nucleophilic substitution and elimination reactions. 7. What factors influence the reactivity of haloarenes in electrophilic substitution reactions? A) The reactivity of haloarenes is influenced by the nature of the halogen, position of the halogen, resonance effects, steric hindrance, and substituent effects. B) Solubility of the haloarene in water. C) Temperature of the reaction. D) The color of the halogen. Show Answer Correct Answer: A) The reactivity of haloarenes is influenced by the nature of the halogen, position of the halogen, resonance effects, steric hindrance, and substituent effects. 8. Which reagent is commonly used to convert alkenes to haloalkanes? A) Alkyl halides. B) Hydrogen halides (HX). C) Carboxylic acids. D) Alcohols. Show Answer Correct Answer: B) Hydrogen halides (HX). 9. Which of the following is a characteristic reaction of haloalkanes:elimination, substitution, or both? A) Reduction. B) Condensation. C) Both. D) Addition. Show Answer Correct Answer: C) Both. 10. What is the role of a catalyst in electrophilic substitution reactions of haloarenes? A) A catalyst is not necessary for electrophilic substitution reactions of haloarenes. B) A catalyst acts as a nucleophile in the reaction mechanism. C) A catalyst decreases the reactivity of haloarenes by stabilizing the substrate. D) A catalyst increases the reactivity of haloarenes by generating a more electrophilic species for substitution. Show Answer Correct Answer: D) A catalyst increases the reactivity of haloarenes by generating a more electrophilic species for substitution. 11. On treating a mixture of two alkyl halides with sodium metal in dry ether, 2-methylpropane was obtained. The alkyl halides are A) Chloromethane and chloroethane. B) 2-chloropropane and chloromethane. C) Chloromethane and 1-chloropropane. D) 2-chloropropane and chloroethane. Show Answer Correct Answer: B) 2-chloropropane and chloromethane. 12. If a substrate undergoing S$_{2}$N reaction was of one stereoisomer, what would the product be like? A) An unequal mixture of enantiomers. B) A non-chiral compound. C) .A racemic mixture. D) One stereoisomer. Show Answer Correct Answer: D) One stereoisomer. 13. What can Grignard reagents be used to synthesize by reacting with carbonyl compounds such as aldehydes and ketones? A) Carboxylic acids. B) Alkenes. C) Alcohols. D) Alkanes. Show Answer Correct Answer: C) Alcohols. 14. Among the following, the suitable reagent for Wurtz-Fittigreaction is A) Na/alcohol. B) Zn/alcohol. C) Zn/ether. D) Na/ether. Show Answer Correct Answer: D) Na/ether. 15. Which of the following molecules has higher dipole moment? A) CH$_{3}$Cl. B) CCl$_{4}$. C) CH$_{2}$Cl$_{2}$. D) CHCl$_{3}$. Show Answer Correct Answer: A) CH$_{3}$Cl. 16. Tertiary alkyl halides are practically inert to substitution by 2 mechanism because A) There is inductive effect. B) There is steric hindrance. C) The carbocation formed is unstable. D) The rate of reaction is faster in S$_{N}$2 mechanism. Show Answer Correct Answer: B) There is steric hindrance. 17. How does the presence of a halogen affect the reactivity of an aromatic compound? A) Halogens increase the reactivity of aromatic compounds due to their electron-donating effects. B) Halogens have no effect on the reactivity of aromatic compounds. C) Halogens make aromatic compounds more stable and less reactive. D) Halogens decrease the reactivity of aromatic compounds due to their electron-withdrawing effects. Show Answer Correct Answer: D) Halogens decrease the reactivity of aromatic compounds due to their electron-withdrawing effects. 18. A mixture of 1-chloropropane and 2-chloropropane when treated with alcoholic KOH gives A) A mixture of prop-1-ene and prop-2-ene. B) Prop-1-ene. C) Propanol. D) Prop-2-ene. Show Answer Correct Answer: B) Prop-1-ene. 19. Among dihaloarenes, the melting point is highest for A) O-Isomer. B) P-Isomer. C) M-Isomer. D) Same for all. Show Answer Correct Answer: B) P-Isomer. 20. What is the main characteristic of the carbon-halogen bond in alkyl halides? A) It is highly stable. B) It is non-polar. C) It is ionic. D) It is polarized. Show Answer Correct Answer: D) It is polarized. 21. How many chiral compounds are possible on monochlorination of 2-methyl butane? A) 4. B) 2. C) 8. D) 6. Show Answer Correct Answer: B) 2. 22. What is the IUPAC name for CH3CH2CH2CH2CH2CH2CH2CH2Cl? A) 1-chlorooctane. B) 2-chlorooctane. C) 3-chloropentane. D) 1-chlorohexane. Show Answer Correct Answer: A) 1-chlorooctane. 23. List two common uses of haloalkanes in industry. A) Refrigerants in cooling systems. B) Solvents and intermediates in pharmaceuticals/agrochemicals. C) Food preservatives in packaging. D) Fuel additives in automotive. Show Answer Correct Answer: B) Solvents and intermediates in pharmaceuticals/agrochemicals. 24. Which of the following is an example of vic-dihalide? A) 1, 2-Dichloroethane. B) Dichloromethane. C) Ethylidene chloride. D) Allyl chloride. Show Answer Correct Answer: A) 1, 2-Dichloroethane. 25. The IUPAC name of (CH$_{3}$)$_{2}$CH-CH$_{2}$-CH$_{2}$Br is A) 2-methyl-4-bromobutane. B) 2-methyl-3-bromopropane. C) 1-bromo-3-methylbutane. D) 1-bromopentane. Show Answer Correct Answer: C) 1-bromo-3-methylbutane. 26. Explain the role of haloarenes in electrophilic substitution reactions. A) Haloarenes exclusively direct electrophiles to the meta position. B) Haloarenes only participate in nucleophilic substitution reactions. C) Haloarenes do not affect the stability of carbocation intermediates. D) Haloarenes play a role in electrophilic substitution reactions by directing electrophiles to ortho/para positions and stabilizing the carbocation intermediate. Show Answer Correct Answer: D) Haloarenes play a role in electrophilic substitution reactions by directing electrophiles to ortho/para positions and stabilizing the carbocation intermediate. 27. Describe the physical properties of haloarenes. A) Haloarenes have lower boiling points than hydrocarbons. B) Haloarenes are colorless liquids or solids, have higher boiling points than hydrocarbons, and are less soluble in water. C) Haloarenes are highly soluble in water. D) Haloarenes are brightly colored gases. Show Answer Correct Answer: B) Haloarenes are colorless liquids or solids, have higher boiling points than hydrocarbons, and are less soluble in water. 28. 10g mixture of iso-butane & iso-butene requires 20g of Br$_{2}$ (in CCl$_{4}$) for complete addition. If 10g of the mixture is catalytically hydrogenated & the entire alkane is monobrominated in the presence of light at 127, how much of it would be formed?(atomic weight of Br=80) A) 24.21g. B) 12g. C) 20.0g. D) 30.0g. Show Answer Correct Answer: A) 24.21g. 29. What should be the correct IUPAC name for diethylbromomethane? A) 1-bromopentane. B) 3-bromopentane. C) 1-bromo-1-ethylpropane. D) 1-bromo-1, 1-diethylmethane. Show Answer Correct Answer: B) 3-bromopentane. 30. What can Grignard reagents be used to synthesize by reacting with silicon halides? A) Organosilicon compounds. B) Amines. C) Alcohols. D) Ethers. Show Answer Correct Answer: A) Organosilicon compounds. 31. Name the following compound:C6H5Cl A) Chlorophenyl. B) Chlorobenzene. C) Chloridebenzene. D) Benzenechloride. Show Answer Correct Answer: B) Chlorobenzene. 32. Which of the following alkyl halides will undergo SN1 reaction most readily? A) (CH3)3 C-F. B) (CH3)3 C-Cl. C) (CH3)3 C-Br. D) (CH3)3 C-I. Show Answer Correct Answer: D) (CH3)3 C-I. 33. How does the polarity of the C-X bond in haloarenes compare to that in haloalkanes? A) More polar. B) Less polar. C) Equally polar. D) Not polar. Show Answer Correct Answer: B) Less polar. 34. What is the significance of the transition state in SN2 reactions? A) The transition state is significant as it determines the activation energy and influences the reaction rate and stereochemistry in SN2 reactions. B) The transition state has no effect on the reaction rate. C) The transition state is a stable intermediate in the reaction. D) The transition state is only relevant in SN1 reactions. Show Answer Correct Answer: A) The transition state is significant as it determines the activation energy and influences the reaction rate and stereochemistry in SN2 reactions. 35. Which effect is responsible for the partial double bond character in the C-X bond of haloarenes? A) Inductive effect. B) Resonance effect. C) Hyperconjugation. D) Electromeric effect. Show Answer Correct Answer: B) Resonance effect. 36. What is the effect of halogen substituents on the acidity of aromatic compounds? A) Halogen substituents increase the acidity of aromatic compounds. B) Halogen substituents have no effect on the acidity of aromatic compounds. C) Halogen substituents decrease the acidity of aromatic compounds. D) Halogen substituents make aromatic compounds more basic. Show Answer Correct Answer: A) Halogen substituents increase the acidity of aromatic compounds. 37. An organic halogen compound which is used as refrigerant in refrigerators and ac is A) BHC. B) Freon. C) CCl$_{4}$. D) CHCl$_{3}$. Show Answer Correct Answer: B) Freon. 38. Assertion:Haloarenes are less reactive than haloalkanes. Reason:The resonance stabilization in haloarenes decreases their reactivity. A) Haloarenes and haloalkanes have the same reactivity. B) Haloarenes are more reactive than haloalkanes. C) True. D) The resonance stabilization in haloalkanes increases their reactivity. Show Answer Correct Answer: C) True. 39. Preparation of Haloalkane (R-X): A) Using alkane with bromonation & UV (Br$_{2}$/UV). B) Using alkene with present of hydrogen bromide (HBr). C) Substitusion R-OH with PBr$_{3}$. D) All above. Show Answer Correct Answer: D) All above. 40. 1-chlorobutane reacts with alcoholic potash to give A) 1-butanol. B) But-1ene. C) But-2-ene. D) None of the above. Show Answer Correct Answer: B) But-1ene. 41. How would you classify 2-bromopropane as a haloalkane? A) Tertairy. B) Secondary. C) Primary. D) Methyl. Show Answer Correct Answer: B) Secondary. 42. Which of the following alkyl halides undergoes hydrolysis with aqueous KOH at the fastest rate? A) CH$_{3}$CH$_{2}$CH$_{2}$Cl. B) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$Cl. C) CH$_{3}$CH$_{2}$Cl. D) CH$_{3}$CH$_{2}$CH(Br)CH$_{3}$. Show Answer Correct Answer: D) CH$_{3}$CH$_{2}$CH(Br)CH$_{3}$. 43. Identify the compound Y in the following reactionC$_{6}$H$_{5}$NH$_{2}$ + NaNO$_{2}$ + HCl ..... $_{0-5}$0$_{ C}$$\rightarrow$C$_{6}$H$_{5}$N$_{2}$$^{+}$Cl$^{-}$ + Cu$_{2}$Cl$_{2 }$/ HCl $\rightarrow$ Y + N$_{2}$ A) 1, 4-Dichloro benzene. B) Chloro benzene. C) Benzene. D) 1, 3-Dichloro benzene. Show Answer Correct Answer: B) Chloro benzene. 44. What is the effect of solvent on the rate of nucleophilic substitution reactions? A) Polar protic solvents always increase the reaction rate. B) The solvent affects the rate of nucleophilic substitution reactions by stabilizing reactants and transition states, influencing nucleophilicity. C) Nucleophilicity is solely determined by the substrate. D) The solvent has no effect on the reaction rate. Show Answer Correct Answer: B) The solvent affects the rate of nucleophilic substitution reactions by stabilizing reactants and transition states, influencing nucleophilicity. 45. What is the role of a nucleophile in a nucleophilic substitution reaction? A) Nucleophiles inhibit the formation of new bonds in the reaction. B) Nucleophiles act as catalysts in the reaction. C) The role of a nucleophile is to accept electrons from the substrate. D) The role of a nucleophile in a nucleophilic substitution reaction is to donate a pair of electrons to form a new bond with the substrate. Show Answer Correct Answer: D) The role of a nucleophile in a nucleophilic substitution reaction is to donate a pair of electrons to form a new bond with the substrate. 46. An alkyl halide RX reacts with KCN to give propane nitrile RX is A) C$_{5}$H$_{11}$Br. B) C$_{4}$H$_{9}$Br. C) C$_{3}$H$_{7}$Br. D) C$_{2}$H$_{5}$Br. Show Answer Correct Answer: D) C$_{2}$H$_{5}$Br. 47. The compound ethylisocyanide is prepared by the reaction between: A) C$_{2}$H$_{5}$Br and KCN. B) C$_{2}$H$_{5}$Br and AgCN. C) C$_{2}$H$_{5}$Br and HCN. D) C$_{2}$H$_{5}$Br and ammonia. Show Answer Correct Answer: B) C$_{2}$H$_{5}$Br and AgCN. 48. What is the difference between SN1 and SN2 mechanisms? A) SN1 involves a two-step mechanism with a carbocation intermediate, while SN2 involves a one-step concerted mechanism. B) SN1 is always faster than SN2. C) SN1 occurs in a single step without intermediates. D) SN2 requires a carbocation intermediate. Show Answer Correct Answer: A) SN1 involves a two-step mechanism with a carbocation intermediate, while SN2 involves a one-step concerted mechanism. 49. Among the isomers of C$_{6}$H$_{11}$Cl, the one which is chiral isi) 2, 2-dimethyl-1-chloropropaneii) 2-chloropentaneiii) 2-methyl-2-chlorobutaneiv) 3-chloopentane A) (i), (ii) and (iii) only. B) (i) and (iii) only. C) (ii) only. D) (i) and (ii) only. Show Answer Correct Answer: C) (ii) only. 50. The fire extinguisher 'pyrene' contains A) Carbon di oxide. B) Chloroform. C) Carbon tetrachloride. D) Carbon disulphide. Show Answer Correct Answer: C) Carbon tetrachloride. 51. When excess chlorine is used in electrophilic substitution of toluene, which of the following dichloroarenes are formed? A) Ortho and meta. B) Ortho and para. C) Meta and para. D) Ortho, meta and para. Show Answer Correct Answer: B) Ortho and para. 52. What is the effect of the carbon chain length on the boiling point of haloalkanes? A) The boiling point of haloalkanes increases with increasing carbon chain length. B) The boiling point of haloalkanes is unaffected by carbon chain length. C) The boiling point of haloalkanes remains constant regardless of carbon chain length. D) The boiling point of haloalkanes decreases with increasing carbon chain length. Show Answer Correct Answer: A) The boiling point of haloalkanes increases with increasing carbon chain length. 53. Which of the following compounds is a secondary haloalkane? A) CH3CH2Br. B) CH3Br. C) CH3CCl3. D) (CH3)2CHBr. Show Answer Correct Answer: D) (CH3)2CHBr. 54. The position of-Br in the compound in CH3CH=CHC(Br)(CH3 ) 2 can be classified as ..... A) (i) Allyl. B) (ii) Aryl. C) (iii) Vinyl. D) (iv) Secondary. Show Answer Correct Answer: A) (i) Allyl. 55. Reaction with alcoholic potassium cyanide. (Chloromethyl)benzene + KCN $\rightarrow$ benzylnitrile (have one extra C, increase chain length by one C) + KX A) R-X + KCN (alcoholic, heat) $\rightarrow$ R-CN (Nu-:CN) + KX. B) R-X + KCN (alcoholic, heat) $\rightarrow$ RKCN + HX. C) All the above. D) None of the above. Show Answer Correct Answer: A) R-X + KCN (alcoholic, heat) $\rightarrow$ R-CN (Nu-:CN) + KX. 56. Which haloarene is used as a solvent in chemical reactions? A) Fluorobenzene. B) Iodobenzene. C) Bromobenzene. D) Chlorobenzene. Show Answer Correct Answer: D) Chlorobenzene. 57. Compound C easily undergoes hydrolysis to form compound D, which forms 2-methylpropene when heated with concentrated sulphuric acid. Using the information above, proposed the structural formula for compound C A) CH$_{3}$CH$_{2}$CH(Br)CH$_{3}$. B) (CH$_{3}$)$_{2}$C(Br)CH$_{3}$. C) CH$_{3}$CH$_{2}$(CH$_{3}$)CH$_{2}$Br. D) CH$_{3}$CH$_{2}$CH$_{2}$CH(Br)CH$_{3}$. Show Answer Correct Answer: B) (CH$_{3}$)$_{2}$C(Br)CH$_{3}$. 58. Reaction with ammonia. RX sealed (prevent escape) with conc. NH3 (Nu-) $\rightarrow$ R-NH2 (primary amine, stronger Nu-and will attack R-X to produce 2$^\circ$ & 3$^\circ$ amines & 4$^\circ$ ammonium salt (NR4) if want to produce 1$^\circ$ amine, NH3 must in large excess) + NH4X. A) Substitution. B) Addition. C) All the above. D) None of the above. Show Answer Correct Answer: A) Substitution. 59. What factors influence the choice between SN1 and SN2 mechanisms? A) The temperature and pressure of the reaction. B) The structure of the substrate and the strength of the nucleophile. C) The presence of a catalyst in the reaction. D) The color of the reactants involved in the reaction. Show Answer Correct Answer: B) The structure of the substrate and the strength of the nucleophile. 60. An unkown alkyl halilde (A) reacts with alcoholic KOH to produce a hydrocarbon (C$_{4}$H$_{8}$) as the$_{ }$ major product. Ozonolysis of the hydrocarbon affords one mole of propanaldehyde and one mole of fomaldehyde. Suggest with organic compound among the following is the correct structure of the above alkyl halide(A)? A) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$Br. B) CH$_{3}$CH(Br)CH(Br)CH$_{3}$. C) CH$_{3}$CHBrCH$_{2}$CH$_{3}$. D) Br(CH$_{2}$)$_{4}$Br. Show Answer Correct Answer: A) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$Br. ← 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 4Class 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