This quiz works best with JavaScript enabled. Home > Class 12 > 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 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which haloalkane is commonly used as a refrigerant? A) Bromochloromethane (R-20). B) Dichlorodifluoromethane (R-12). C) Chlorodifluoromethane (R-22). D) Trichlorofluoromethane (R-11). Show Answer Correct Answer: B) Dichlorodifluoromethane (R-12). 2. Hydrolysis. R-X + NaOH (OH-Nu-) heat (boiled under reflux) $\rightarrow$ R-OH (alcohol) + NaXchlorocyclohexane $\rightarrow$ cyclohexanol. Due to:1. bigger size X, 2. weaker C-X bond, 3. reactivity increaserate rxn hydrolysis ..... A) R-Cl < R-Br < R-I (more reactive). B) (more reactive) R-Cl > R-Br > R-I. C) All the above. D) None of the above. Show Answer Correct Answer: A) R-Cl < R-Br < R-I (more reactive). 3. The typical reaction of alkyl halide is: A) Electrophillic substitution. B) Nucleophillic substitution. C) Electrophillic addition. D) Nucleophillic addition. Show Answer Correct Answer: B) Nucleophillic substitution. 4. What is the effect of halogen substituents on the acidity of haloarenes? A) Halogen substituents decrease the acidity of haloarenes. B) Halogen substituents have no effect on the acidity of haloarenes. C) Halogen substituents increase the acidity of haloarenes. D) Halogen substituents make haloarenes neutral in acidity. Show Answer Correct Answer: C) Halogen substituents increase the acidity of haloarenes. 5. In the following sequence of reactionsCH$_{3}$CH$_{2}$CH$_{2}$Br+ (alc) KOH $\rightarrow$(A) + HBr $\rightarrow$ (B) + (aq) KOH $\rightarrow$ (C).The product (C) is A) Propan-2-ol. B) Propan-1-ol. C) Propyne. D) Propene. Show Answer Correct Answer: A) Propan-2-ol. 6. Grignard reagent, a very useful starting compound for a number of organic reactions can be prepared by A) Reaction of MgCl$_{2}$ with ether and alcohol. B) Reaction of alkyl halides with a solution of magnesium hydroxide. C) Reaction of alkyl halide with magnesium in presence of alcohol. D) Reaction of alkyl halides with dry magnesium powder in the presence of dry ether. Show Answer Correct Answer: D) Reaction of alkyl halides with dry magnesium powder in the presence of dry ether. 7. Which of the following compounds is the rate of alkaline hydrolysis that is independent of the concentration of the hydroxide ion? A) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$Cl. B) CH$_{3}$CH(Br)CH$_{3}$. C) C$_{6}$H$_{5}$CH$_{2}$CH$_{2}$I. D) (CH$_{3}$)$_{3}$CBr. Show Answer Correct Answer: D) (CH$_{3}$)$_{3}$CBr. 8. What is the rate dependency of S N 2 reactions? A) Variable order. B) First order. C) Second order. D) Zero order. Show Answer Correct Answer: C) Second order. 9. Name a method to convert haloalkanes to alkenes. A) Elimination reaction using a strong base (e.g., KOH). B) Hydrogenation of haloalkanes. C) Reduction using lithium aluminum hydride. D) Nucleophilic substitution with water. Show Answer Correct Answer: A) Elimination reaction using a strong base (e.g., KOH). 10. Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism? A) Ethyl chloride. B) Isopropyl chloride. C) Choro benzene. D) Benzyl chloride. Show Answer Correct Answer: D) Benzyl chloride. 11. Chloroform is kept in dark coloured bottles because A) It reacts with clear glass. B) It is oxidized to poisonous gas, phosgene in sunlight. C) It undergoes chlorination in transparent glass bottles. D) It starts burning when exposed to sunlight. Show Answer Correct Answer: B) It is oxidized to poisonous gas, phosgene in sunlight. 12. Which type of solvent favors S N 1 reactions? A) Polar protic solvents. B) Non-polar solvents. C) Polar aprotic solvents. D) Ionic solvents. Show Answer Correct Answer: A) Polar protic solvents. 13. How does the nature of the leaving group affect the mechanism of nucleophilic substitution? A) A better leaving group favors SN1 mechanisms over SN2. B) Leaving groups only affect the rate of the reaction, not the mechanism. C) The leaving group does not influence the mechanism. D) A better leaving group favors SN2 mechanisms over SN1. Show Answer Correct Answer: D) A better leaving group favors SN2 mechanisms over SN1. 14. Which statement is true about the C-X bond in alkyl halides? A) It is purely ionic. B) It has partial double bond character. C) It is polarized with carbon positive. D) It is purely covalent. Show Answer Correct Answer: C) It is polarized with carbon positive. 15. Arrange compound below according to decreasing boiling point;Pentane, 2-chloropropane, 1-butanol, 2-methylbutane A) 2-chloropropane, 1-butanol, 2-methylbutane, Pentane. B) 1-butanol, 2-chloropropane, Pentane, 2-methylbutane. C) 2-chloropropane, 2-methylbutane, Pentane, 1-butanol. D) 2-methylbutane, Pentane, 2-chloropropane, 1-butanol. Show Answer Correct Answer: B) 1-butanol, 2-chloropropane, Pentane, 2-methylbutane. 16. Explain the difference between primary, secondary, and tertiary haloalkanes. A) Tertiary haloalkanes have one carbon attached to the halogen. B) Primary haloalkanes have two carbons attached to the halogen. C) Primary haloalkanes have one carbon attached to the halogen, secondary have two, and tertiary have three. D) Secondary haloalkanes have three carbons attached to the halogen. Show Answer Correct Answer: C) Primary haloalkanes have one carbon attached to the halogen, secondary have two, and tertiary have three. 17. Toulene reacts with a halogen in the presence of iron(III) chloride giving ortho and para halo compounds. The reaction is A) Electrophilic elimination reaction. B) Free radical addition reaction. C) Electrophilic substitution reaction. D) Nucleophilic substitution reaction. Show Answer Correct Answer: C) Electrophilic substitution reaction. 18. An aryl chloride that helps in the treatment of typhoid fever is ..... A) Chloroquine. B) Chloroform. C) Cholorobenzene. D) Chloramphenicol. Show Answer Correct Answer: D) Chloramphenicol. 19. Test for 1-chlorobutane and 1-iodobutane A) Use silver nitrate, AgNO3$\rightarrow$ AgCl (white precipitate).$\rightarrow$ AgI (yellow ppt). B) Use silver nitrate, AgNO3$\rightarrow$ AgCl (yellow ppt).$\rightarrow$ AgI (white precipitate). C) All the above. D) None of the above. Show Answer Correct Answer: A) Use silver nitrate, AgNO3$\rightarrow$ AgCl (white precipitate).$\rightarrow$ AgI (yellow ppt). 20. Which of the following is not an allyclic halide? A) 1-Bromobut-2-ene. B) 4-Bromopent-2-ene. C) 4-Bromobut-1-ene. D) 3-Bromo-2-methylbut-1-ene. Show Answer Correct Answer: C) 4-Bromobut-1-ene. 21. Which alkyl halide has the highest reactivity for a particular alkyl group? A) R-F. B) R-Cl. C) R-I. D) R-Br. Show Answer Correct Answer: C) R-I. 22. What is the primary method for preparing haloarenes? A) Dehydrohalogenation. B) Radical substitution. C) Nucleophilic substitution. D) Electrophilic aromatic substitution. Show Answer Correct Answer: D) Electrophilic aromatic substitution. 23. CH$_{3}$CHCl$_{2}$ and CH$_{2}$Cl CH$_{2}$Cl are examples of: A) Functional isomers. B) Metamers. C) Chain isomers. D) Position isomers. Show Answer Correct Answer: D) Position isomers. 24. What is the main driving force for the nucleophilic substitution reaction of haloalkanes? A) Polarization of the C-X bond. B) Formation of a stable carbocation. C) Release of a leaving group. D) Formation of a double bond. Show Answer Correct Answer: C) Release of a leaving group. 25. Aryl halides are less reactive towards nucleophilic substitution due to: A) Resonance stabilization. B) Inductive effect. C) Smaller size of halogen. D) High polarity of C-X bond. Show Answer Correct Answer: A) Resonance stabilization. ← PreviousNext →Related 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 10 Haloalkanes And Haloarenes Quiz 8Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 9Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 10Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books