This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes – Quiz 14 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 14 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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$_{3}$CH$_{2}$CH$_{2}$CH(Br)CH$_{3}$. C) CH$_{3}$CH$_{2}$(CH$_{3}$)CH$_{2}$Br. D) (CH$_{3}$)$_{2}$C(Br)CH$_{3}$. Show Answer Correct Answer: D) (CH$_{3}$)$_{2}$C(Br)CH$_{3}$. 2. 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. 3. 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. 4. 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$_{3}$CHBrCH$_{2}$CH$_{3}$. B) CH$_{3}$CH(Br)CH(Br)CH$_{3}$. C) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$Br. D) Br(CH$_{2}$)$_{4}$Br. Show Answer Correct Answer: C) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$Br. 5. How does the presence of halogens affect the acidity of haloarenes? A) Halogens increase the acidity of haloarenes by forming stronger bonds with hydrogen. B) Halogens have no effect on the acidity of haloarenes. C) Halogens increase the acidity of haloarenes by stabilizing the conjugate base. D) Halogens decrease the acidity of haloarenes by destabilizing the conjugate base. Show Answer Correct Answer: C) Halogens increase the acidity of haloarenes by stabilizing the conjugate base. 6. Assertion (A):Presence of nitro group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution reaction.Reason (R):Nitro group being an electron withdrawing group decreases the electron density over the benzene ring. A) Both A and R are correct; R is the correct explanation of A. B) Both A and R are correct; R is not the correct explanation of A. C) A is correct; R is incorrect. D) A is incorrect; R is correct. Show Answer Correct Answer: A) Both A and R are correct; R is the correct explanation of A. 7. S$_{N}$2 mechanism favor A) Methyl halide. B) 3$^\circ$ haloalkane. C) All the above. D) None of the above. Show Answer Correct Answer: A) Methyl halide. 8. Assertion:Haloalkanes can be prepared by the reaction of alcohols with hydrogen halides. Reason:This reaction is known as halogenation. A) Assertion is false, Reason is true. B) Both Assertion and Reason are true. C) Both Assertion and Reason are false. D) Assertion is true, Reason is false. Show Answer Correct Answer: D) Assertion is true, Reason is false. 9. Iodoform can be prepared from all except A) Isopropyl alcohol. B) 3-methyl-3-butanone. C) Ethylmethyl ketone. D) Isobutyl alcohol. Show Answer Correct Answer: D) Isobutyl alcohol. 10. Which of the following cannot be prepared by the Wurtz reaction? A) Ethane. B) Propane. C) N-Butane. D) Methane. Show Answer Correct Answer: D) Methane. 11. Arrange the following compounds in decreasing order of their boiling points.i) CH$_{3}$Brii) CH$_{3}$CH$_{2}$Briii) CH$_{2}$CH$_{2}$CH$_{2}$Briv) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$Br A) (i)>(iii)>(ii)>(iv). B) (i)>(ii)>(iii)>(iv). C) (iii)>(iv)>(i)>(ii). D) (iv)>(iii)>(ii)>(i). Show Answer Correct Answer: D) (iv)>(iii)>(ii)>(i). 12. What is the role of a catalyst in electrophilic aromatic substitution? A) A catalyst decreases the stability of the aromatic ring. B) A catalyst acts as a nucleophile in the reaction. C) A catalyst is not necessary for electrophilic aromatic substitution. D) A catalyst increases the reactivity of the electrophile in electrophilic aromatic substitution. Show Answer Correct Answer: D) A catalyst increases the reactivity of the electrophile in electrophilic aromatic substitution. 13. Assertion:The preparation of haloalkanes can also be achieved through the reaction of alkenes with halogens. Reason:This is known as halogenation of alkenes. A) The reaction of alkenes with halogens is called hydrogenation. B) Halogenation involves the reaction of haloalkanes with alkenes. C) True. D) Haloalkanes cannot be prepared from alkenes. Show Answer Correct Answer: C) True. 14. Alkyl halide on treatment with aqueous KOH give A) Acids. B) Alcohols. C) Aldehydes. D) Alkanes. Show Answer Correct Answer: B) Alcohols. 15. Which of the following halogenated compounds is most commonly used as a refrigerant? A) Chlorofluorocarbon (CFC). B) All of the above. C) Hydrochlorofluorocarbon (HCFC). D) Perfluorocarbon (PFC). Show Answer Correct Answer: B) All of the above. 16. What is the primary reaction type that haloalkanes undergo with nucleophiles? A) Elimination reaction. B) Redox reaction. C) Addition reaction. D) Nucleophilic substitution. Show Answer Correct Answer: D) Nucleophilic substitution. 17. The reaction:R-Cl + KI $\rightarrow$ RI + KCl (in presence of acetone)Is known as A) Hunsdieker reaction. B) Finkelstein reaction. C) Ulmann reaction. D) Wurtz reaction. Show Answer Correct Answer: B) Finkelstein reaction. 18. S$_{N}$1 mechanism favor A) 3$^\circ$ haloalkane. B) 1$^\circ$ haloalkane. C) All the above. D) None of the above. Show Answer Correct Answer: A) 3$^\circ$ haloalkane. 19. How do you classify haloalkanes based on the carbon atom to which the halogen is attached? A) Haloalkanes are classified as primary, secondary, or tertiary based on the carbon atom to which the halogen is attached. B) Haloalkanes are classified as aromatic or aliphatic. C) Haloalkanes are classified based on the number of hydrogen atoms. D) Haloalkanes are classified by their boiling points. Show Answer Correct Answer: A) Haloalkanes are classified as primary, secondary, or tertiary based on the carbon atom to which the halogen is attached. 20. Which of the following is a feature of the Sn1 reaction mechanism? A) It involves a single step. B) It is favored by polar aprotic solvents. C) It forms a carbocation intermediate. D) It occurs with primary haloalkanes only. Show Answer Correct Answer: C) It forms a carbocation intermediate. 21. Assertion:Haloalkanes are generally more soluble in water than haloarenes. Reason:Haloalkanes can form hydrogen bonds with water molecules. A) Haloalkanes are less soluble in water than haloarenes. B) Haloalkanes cannot form hydrogen bonds with water molecules. C) Haloarenes are more soluble in water than haloalkanes. D) False. Show Answer Correct Answer: D) False. 22. What is the IUPAC name for CH3CH2Br? A) Bromoethanol. B) Ethylbromide. C) Dibromoethane. D) 1-bromoethane. Show Answer Correct Answer: D) 1-bromoethane. 23. Which reagent is commonly used to convert haloalkanes into alcohols? A) NaBH4. B) H2O. C) KOH (aq). D) NaOH (dry). Show Answer Correct Answer: C) KOH (aq). 24. The reaction:CH$_{3}$Br + AgF $\rightarrow$ CH$_{3}$F + AgBr is called A) Swarts reaction. B) Finkelstein reaction. C) Gattermann reaction. D) Perkin reaction. Show Answer Correct Answer: A) Swarts reaction. 25. What type of bond is present in haloalkanes? A) Hydrogen bond. B) Metallic bond. C) Ionic bond. D) Covalent bond. Show Answer Correct Answer: D) Covalent bond. ← 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