This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes – Quiz 18 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 18 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What are the physical properties that distinguish haloalkanes from alkanes? A) Haloalkanes are more soluble in water than alkanes. B) Haloalkanes have higher boiling points, greater polarity, and different solubility compared to alkanes. C) Haloalkanes have lower boiling points than alkanes. D) Haloalkanes are less polar than alkanes. Show Answer Correct Answer: B) Haloalkanes have higher boiling points, greater polarity, and different solubility compared to alkanes. 2. For a given halogen atom the reactivity is maximum for A) Methyl halide. B) Primary halide. C) Secondary halide. D) Tertiary halide. Show Answer Correct Answer: D) Tertiary halide. 3. Assertion:Haloalkanes undergo nucleophilic substitution reactions. Reason:The carbon atom in haloalkanes is electrophilic due to the presence of a halogen. A) Both the assertion and reason are correct. B) Haloalkanes do not undergo nucleophilic substitution reactions. C) Both the assertion and reason are incorrect. D) The carbon atom in haloalkanes is nucleophilic due to the presence of a halogen. Show Answer Correct Answer: A) Both the assertion and reason are correct. 4. Which statements are true about the characteristics of a fluoroalkane?1 It is less reactive than chloroalkane2 It is not easily flammable 3 It can be used as aerosol propellant A) 1 only is correct. B) 1 & 2 only are correct. C) 2 & 3 only are correct. D) 1, 2 & 3 are correct. Show Answer Correct Answer: D) 1, 2 & 3 are correct. 5. Tertiary alkyl halide are practically inert to substitution by SN2 mechanism A) Carbocation formed is unstable. B) There is steric hindrance. C) There is inductive effect. D) The rate of reaction is faster in SN2 mechanism. Show Answer Correct Answer: B) There is steric hindrance. 6. Chlorobenzene on treatment with Na in dry ether gives diphenyl. The name of the reaction is A) Wurtz-Fittig reaction. B) Gattermann reaction. C) Fittig reaction. D) Sandmeyer reaction. Show Answer Correct Answer: C) Fittig reaction. 7. Mechanism for hydrolysis of iodoethane to ethanol by aqueous NaOH A) S$_{N}$2. B) S$_{N}$1. C) All the above. D) None of the above. Show Answer Correct Answer: A) S$_{N}$2. 8. The correct order of the thermal stability of hydrogen halides (H-X) is A) HF > HCl > HBr > HI. B) HI > HBr > HCl > HF. C) HI > HCl < HF > HBr. D) HCl < HBr > HBr < HI. Show Answer Correct Answer: A) HF > HCl > HBr > HI. 9. Which of the following compounds can yield only one monochlorinated product upon free radical chlorination? A) 2, 2-dimethylpropane. B) 2-methylpropane. C) 2-methylbutane. D) N-butane. Show Answer Correct Answer: A) 2, 2-dimethylpropane. 10. Assertion:The presence of halogens in haloarenes makes them more polar than benzene. Reason:Halogens are electronegative and withdraw electron density from the aromatic ring. A) True. B) Halogens increase the electron density of the aromatic ring. C) Benzene is more polar than haloarenes due to its structure. D) Halogens do not affect the polarity of benzene. Show Answer Correct Answer: A) True. 11. Assertion:Haloarenes can be synthesized from phenols by halogenation. Reason:This reaction involves the substitution of a hydrogen atom with a halogen atom. A) Haloarenes cannot be synthesized from phenols. B) The reaction involves the addition of a halogen atom, not substitution. C) Phenols are not involved in the synthesis of haloarenes. D) Both the assertion and reason are true, and the reason correctly explains the assertion. Show Answer Correct Answer: D) Both the assertion and reason are true, and the reason correctly explains the assertion. 12. Discuss the stability of carbocations in haloalkane reactions. A) Primary carbocations are more stable than tertiary carbocations. B) Tertiary carbocations are the most stable, followed by secondary, primary, and methyl carbocations. C) Methyl carbocations are the most stable, followed by primary, secondary, and tertiary. D) Secondary carbocations are the least stable, followed by primary, tertiary, and methyl. Show Answer Correct Answer: B) Tertiary carbocations are the most stable, followed by secondary, primary, and methyl carbocations. 13. If no bond around the stereocenter is broken the product is said to have A) Inversion of configuration. B) Retention of configuration. C) All the above. D) None of the above. Show Answer Correct Answer: B) Retention of configuration. 14. What is the reactivity of haloarenes compared to haloalkanes? A) More reactive. B) Less reactive. C) Equally reactive. D) Not reactive. Show Answer Correct Answer: B) Less reactive. 15. Give an example of a nucleophile used in SN2 reactions. A) Bromide ion (Br-). B) Chloride ion (Cl-). C) Sodium ion (Na+). D) Hydroxide ion (OH-). Show Answer Correct Answer: D) Hydroxide ion (OH-). 16. Is haloalkane polar or non polar? A) Polar molecules. B) Non polar molecules. C) All the above. D) None of the above. Show Answer Correct Answer: A) Polar molecules. 17. Which compound do not have sec. carbon? A) Phenol. B) 2-Clorobutane. C) Butane. D) Ethanol. Show Answer Correct Answer: D) Ethanol. 18. Which of the following is a method of preparing haloalkanes from alcohols? A) Electrophilic substitution. B) Free radical halogenation. C) Nucleophilic substitution. D) Hydrolysis. Show Answer Correct Answer: C) Nucleophilic substitution. 19. Which of the following alkyl halides is hydrolysed by S$_{N}$1 mechanism? A) CH$_{3}$CH$_{2}$Cl. B) CH$_{3}$Cl. C) CH$_{3}$CH$_{2}$CH$_{2}$Cl. D) (CH$_{3}$)$_{3}$CCl. Show Answer Correct Answer: D) (CH$_{3}$)$_{3}$CCl. 20. What type of nucleophiles are typically used in SN1 reactions? A) Weak nucleophiles such as water or alcohols. B) Strong nucleophiles like hydroxide ions. C) Charged nucleophiles such as amines. D) Nucleophiles that are highly reactive and unstable. Show Answer Correct Answer: A) Weak nucleophiles such as water or alcohols. 21. 2-Bromo-3, 3-dimethylbutane on reaction with aqueous KOH yields X as the major product. X is A) 2, 3-dimethylbutan-2-ol. B) 2, 3, 3-trimethylpropan-1-ol. C) 2, 2-dimethylpropan-2-ol. D) 2, 2-dimethybutan-3-ol. Show Answer Correct Answer: A) 2, 3-dimethylbutan-2-ol. 22. Complete the following reaction R-OH + PCl5 $\rightarrow$ A) PCl3. B) PCl5. C) POCl3. D) POBr3. Show Answer Correct Answer: C) POCl3. 23. An alkyl chloride produces a single alkene on reaction with sodium ethoxide and ethanol. The alkene further undergoes hydrogenation to yield 2-methylbutane. Identify the alkyl chloride amongst the following compounds. A) ClCH$_{2}$CH(CH$_{3}$)CH$_{2}$CH$_{3}$. B) CH$_{3}$C(Cl)(CH$_{3}$)CH$_{2}$CH$_{3}$. C) ClCH$_{2}$CH(CH$_{3}$)CH$_{2}$CH$_{3}$. D) ClCH$_{2}$CH$_{2}$CH$_{2}$CH$_{3}$. Show Answer Correct Answer: A) ClCH$_{2}$CH(CH$_{3}$)CH$_{2}$CH$_{3}$. 24. Alkenes react with hydrogen halides, HX to formed haloalkane. In the reaction;I. the pi electrons are used to form a bond with the hydrogen atom from HXII. the intermediate product is carbocationIII. the rate of reaction increases in the order:HF, HCl, HBr, HI A) I only. B) I and II only. C) II and III only. D) I, II and III. Show Answer Correct Answer: D) I, II and III. 25. What is the stereochemistry outcome of S N 1 reactions? A) Racemization reactions. B) Inversion reactions. C) Retain stereochemistry. D) No change in stereochemistry. Show Answer Correct Answer: A) Racemization reactions. ← 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