This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes – Quiz 16 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 16 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. When an alkyl halide reacts with alcoholic KOH, the major product is: A) Alcohol. B) Alkene. C) Ether. D) Halogen exchange compound. Show Answer Correct Answer: B) Alkene. 2. Methyl bromide reacts with AgF to give methylflouride and silver bromide. This reaction is called A) Swarts reaction. B) Fittig reaction. C) Wurtz reaction. D) Finkelstein reaction. Show Answer Correct Answer: A) Swarts reaction. 3. What are the common methods for synthesizing haloarenes? A) Hydrogenation of aryl compounds. B) Friedel-Crafts acylation. C) Common methods for synthesizing haloarenes include electrophilic aromatic substitution, Sandmeyer reaction, and nucleophilic aromatic substitution. D) Grignard reaction. Show Answer Correct Answer: C) Common methods for synthesizing haloarenes include electrophilic aromatic substitution, Sandmeyer reaction, and nucleophilic aromatic substitution. 4. Good conductor of electricity and heat is A) Anthracite cake. B) Diamond. C) Charcoal. D) Graphite. Show Answer Correct Answer: D) Graphite. 5. In a molecule of tertiary haloalkanes, carbon atom is bonded to A) 3 carbon atoms. B) 2 carbon atoms. C) 4 carbon atoms. D) 1 carbon atom. Show Answer Correct Answer: A) 3 carbon atoms. 6. What type of reaction do haloalkanes typically undergo with nucleophiles? A) Radical substitution. B) Electrophilic addition. C) Nucleophilic substitution. D) Elimination reaction. Show Answer Correct Answer: C) Nucleophilic substitution. 7. What is the significance of ortho and para positions in haloarenes? A) The ortho and para positions are less reactive due to steric hindrance. B) The ortho and para positions in haloarenes are more reactive for electrophilic substitution due to stabilization of the carbocation intermediate. C) Electrophilic substitution is favored at the meta position in haloarenes. D) The ortho and para positions are only relevant in aliphatic compounds. Show Answer Correct Answer: B) The ortho and para positions in haloarenes are more reactive for electrophilic substitution due to stabilization of the carbocation intermediate. 8. What is the difference between SN1 and SN2 mechanisms in nucleophilic substitution reactions? A) The main difference between SN1 and SN2 mechanisms is the number of steps involved and the nature of the transition state. B) SN1 reactions are faster than SN2 reactions. C) SN1 involves a concerted mechanism while SN2 involves stepwise mechanism. D) The difference lies in the type of nucleophile used. Show Answer Correct Answer: A) The main difference between SN1 and SN2 mechanisms is the number of steps involved and the nature of the transition state. 9. Which of the following is most reactive towards aqueous NaOH? A) C$_{6}$H$_{5}$CH$_{2}$Cl. B) BrC$_{6}$H$_{4}$Br. C) C$_{6}$H$_{5}$Cl. D) C$_{6}$H$_{5}$Br. Show Answer Correct Answer: A) C$_{6}$H$_{5}$CH$_{2}$Cl. 10. Name the pesticide whose resistance was developed by many organisms and banned in some countries?? A) Dicholoro-diphenyl-tricholroethane. B) Freons. C) Dicholro-diphenylether. D) Cholroform. Show Answer Correct Answer: A) Dicholoro-diphenyl-tricholroethane. 11. What causes the dipole moment in haloalkanes and haloarenes? A) The size of the halogen atom. B) The polarity of the C-X bond. C) The hybridization of carbon. D) The reactivity of the compound. Show Answer Correct Answer: B) The polarity of the C-X bond. 12. Reactions involving grignard reagents reaction with CO2 A) RMgX + CO2 + H2O $\rightarrow$ RCOOH + Mg(OH)X. B) RMgX + CO2 + H2O $\rightarrow$ ROH + Mg(OH)X. C) All the above. D) None of the above. Show Answer Correct Answer: A) RMgX + CO2 + H2O $\rightarrow$ RCOOH + Mg(OH)X. 13. The solution used to distinguish chloroform and iodoform is A) Silver nitrate solution. B) Sodium iodide. C) Silver chloride solution. D) None of the above. Show Answer Correct Answer: A) Silver nitrate solution. 14. Iodoalkanes are prepared from chloro or bromoalkane using ..... and the name of the reaction is ..... A) NaI, SWARTS. B) NaI, FINKELSTEIN. C) AgI, SWARTS. D) None of the above. Show Answer Correct Answer: B) NaI, FINKELSTEIN. 15. What role does the leaving group play in nucleophilic substitution reactions? A) The leaving group stabilizes the substrate before reaction. B) The leaving group enhances the nucleophile's strength. C) The leaving group departs from the substrate, allowing the nucleophile to take its place. D) The leaving group acts as a catalyst in the reaction. Show Answer Correct Answer: C) The leaving group departs from the substrate, allowing the nucleophile to take its place. 16. What is the hybridization of carbon in haloarenes? A) Sp. B) Sp2. C) Sp3. D) Sp3d. Show Answer Correct Answer: B) Sp2. 17. Alkyl halides are formed when thionyl chloride and ..... are refluxed in presence of pyridine.The order of reactivity (3$^{0}$>2$^{0}$>1$^{0}$) is due to +1 effect of the alkyl group which ..... the polarity of C-X bond. A) Aldehydes, changes. B) Acids, decreases. C) Ketones, decreases. D) Alcohols, increases. Show Answer Correct Answer: D) Alcohols, increases. 18. Describe the carbocation stability in SN1 reactions. A) Tertiary > Primary > Secondary > Methyl. B) Methyl > Primary > Secondary > Tertiary. C) Tertiary > Secondary > Primary > Methyl. D) Secondary > Methyl > Tertiary > Primary. Show Answer Correct Answer: C) Tertiary > Secondary > Primary > Methyl. 19. Explain the role of haloalkanes in organic synthesis. A) Haloalkanes are stable compounds that do not participate in any chemical reactions. B) Haloalkanes are key intermediates in organic synthesis, enabling the formation of various functional groups through nucleophilic reactions. C) Haloalkanes are primarily used as solvents in organic reactions. D) Haloalkanes are only used in polymer production and have no role in organic synthesis. Show Answer Correct Answer: B) Haloalkanes are key intermediates in organic synthesis, enabling the formation of various functional groups through nucleophilic reactions. 20. Name the reaction which yields alkyl flourides A) Finkelstein reaction. B) Wurtz reaction. C) Swarts Reaction. D) Riemer-tiemann reaction. Show Answer Correct Answer: C) Swarts Reaction. 21. The types of mechanism in topic halolakane: A) S$_{N}$ 1$_{ }$. B) S$_{N}$ 2. C) S$_{N}$ 1 & S$_{N}$ 2. D) No idea. Show Answer Correct Answer: C) S$_{N}$ 1 & S$_{N}$ 2. 22. In a SN1 reaction on chiral centres, there is A) 100% retention. B) 100% inversion. C) Racemization. D) None. Show Answer Correct Answer: C) Racemization. 23. Which of the following haloalkanes reacts with aqueous KOH most easily? A) 2-bromo-2-methylpropane. B) 2-chlorobutane. C) 1-bromobutane. D) 2-bromobutane. Show Answer Correct Answer: A) 2-bromo-2-methylpropane. 24. Haloalkane is a polar molecule that undergoes nucleophilic substitution through S$_{N}$1 and S$_{N}$2. Arrange the following haloalkanes in order of increasing rate of unimolecular nucleophilic substitution reaction:I. 2-chloro-2-methylpropaneII. 2-chlorobutaneIII. 1-chlorobutane A) I< II < III. B) I< III < II. C) III< I < II. D) III< II < I. Show Answer Correct Answer: D) III< II < I. 25. Which of the following reactions can be used to fluorinate a compound? A) Sandmeyer's reaction. B) Darzen's reaction. C) Hunsdicker reaction. D) Swartz reaction. Show Answer Correct Answer: D) Swartz reaction. ← 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 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 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 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books