This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 3 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The compounds used as refrigerant are A) NH3. B) CCl4. C) CF4. D) CF2Cl2. E) CH2F2. Show Answer Correct Answer: D) CF2Cl2. 2. What is the reaction mechanism involved in the preparation of alkyl halides from alcohols? A) Addition reaction. B) Oxidation reaction. C) Elimination reaction. D) Substitution reaction. Show Answer Correct Answer: D) Substitution reaction. 3. Why does the reaction C$_{2}$H$_{5}$X + OH$^{-}$ $\rightarrow$ C$_{2}$H$_{5}$OH + X$^{-}$ occur faster if X is iodine instead of Bromine? A) The I$^{-}$ion is a stronger nucleophile than the Br$^{-}$ion. B) The I$^{-}$ ion is less hydrated in water than the Br$^{-}$ ion. C) C-Br bond is more polar than the C-I bond. D) The C-Br bond is stronger than the C-I bond. Show Answer Correct Answer: D) The C-Br bond is stronger than the C-I bond. 4. S$_{N}$1 stand for A) Unimolecular nucleophilic substitution. B) Bimolecular nucleophilic substitution. C) All the above. D) None of the above. Show Answer Correct Answer: A) Unimolecular nucleophilic substitution. 5. Halogenation, Sulphonation, Friedel-Crafts reactionof haloarene comes under A) Nucleophilic substitution reaction. B) Electrophilic substitution reaction. C) Addition reaction. D) Elimination reaction. Show Answer Correct Answer: B) Electrophilic substitution reaction. 6. Provide an example of an electrophilic substitution reaction involving an aryl halide. A) Chlorobenzene + H2SO4 $\rightarrow$ Phenol + HCl. B) Bromobenzene + HNO3/H2SO4 $\rightarrow$ Nitrobenzene + HBr. C) Fluorobenzene + Br2/FeBr3 $\rightarrow$ Bromobenzene + HF. D) Iodobenzene + H2O2/H+ $\rightarrow$ Hydroxybenzene + HI. Show Answer Correct Answer: B) Bromobenzene + HNO3/H2SO4 $\rightarrow$ Nitrobenzene + HBr. 7. What is the main environmental concern regarding haloalkanes? A) Ozone layer depletion and environmental toxicity. B) Increased carbon emissions from vehicles. C) Destruction of marine habitats by plastics. D) Overpopulation of urban areas due to industrialization. Show Answer Correct Answer: A) Ozone layer depletion and environmental toxicity. 8. What is the impact of electron-withdrawing groups on the reactivity of haloalkanes? A) Electron-withdrawing groups increase the reactivity of haloalkanes. B) Electron-withdrawing groups decrease the reactivity of haloalkanes. C) Electron-withdrawing groups have no effect on the reactivity of haloalkanes. D) Electron-withdrawing groups only affect the boiling point of haloalkanes. Show Answer Correct Answer: B) Electron-withdrawing groups decrease the reactivity of haloalkanes. 9. Assertion (A):Nitration of chlorobenzene leads to the formation of ortho and para nitrochlorobenzene.Reason (R):-NO$_{2}$ group is o and p-directing group. 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 A. C) A is correct; R is incorrect. D) A is incorrect; R is correct. Show Answer Correct Answer: C) A is correct; R is incorrect. 10. Molecules whose mirror image is non-superimposable over them are known as chiral. Which of the following molecules is chiral in nature? A) 2-bromobutane. B) 1-bromobutane. C) 2-bromopropane. D) 2-bromopropan-2-ol. Show Answer Correct Answer: A) 2-bromobutane. 11. Chlorobenzene is formed by reaction of chlorine with benzene in the presence of AlCl3. Which of the following species attacks the benzene ring in this reaction? A) Cl-. B) Cl+. C) AlCl3. D) [AlCl4]-. Show Answer Correct Answer: B) Cl+. 12. How do haloalkanes undergo elimination reactions? A) Haloalkanes decompose directly into alkynes. B) Haloalkanes undergo elimination reactions via E1 or E2 mechanisms, leading to the formation of alkenes. C) Haloalkanes can only undergo substitution reactions. D) Haloalkanes react with water to form alcohols. Show Answer Correct Answer: B) Haloalkanes undergo elimination reactions via E1 or E2 mechanisms, leading to the formation of alkenes. 13. The decreasing reactivity of haloalkane towards S$_{N}$2 reaction A) 1$^\circ$ > 2$^\circ$> 3$^\circ$. B) 3$^\circ$ > 2$^\circ$> 1$^\circ$. C) All the above. D) None of the above. Show Answer Correct Answer: A) 1$^\circ$ > 2$^\circ$> 3$^\circ$. 14. Which type of nucleophiles are involved in S N 2 reactions? A) Strong nucleophiles. B) Weak nucleophiles. C) Electrophiles. D) Neutral nucleophiles. Show Answer Correct Answer: A) Strong nucleophiles. 15. Methyl bromide reacts with AgF to give methyl fluoride and silver bromide. This reaction is called A) Swarts reaction. B) Wurtz reaction. C) Fiitig reaction. D) Finkelstein reaction. Show Answer Correct Answer: A) Swarts reaction. 16. Describe the electrophilic aromatic substitution mechanism using bromobenzene as an example. A) Direct substitution without a sigma complex. B) Formation of a carbocation intermediate. C) The electrophilic aromatic substitution mechanism involves the formation of a bromonium ion, attack by the aromatic ring, formation of a sigma complex, and loss of a proton to restore aromaticity. D) Loss of a bromine atom instead of a proton. Show Answer Correct Answer: C) The electrophilic aromatic substitution mechanism involves the formation of a bromonium ion, attack by the aromatic ring, formation of a sigma complex, and loss of a proton to restore aromaticity. 17. The reagent used to convert propene to propanol is A) I) HBr/Peroxide ii) KOH (alc.). B) I) HBr ii) KOH (aq.). C) I) HBr/Peroxide ii) KOH (aq.). D) I) HBr ii) KOH (alc.). Show Answer Correct Answer: C) I) HBr/Peroxide ii) KOH (aq.). 18. How does the strength of the nucleophile influence SN2 reactions? A) Weaker nucleophiles are preferred in SN2 reactions. B) The strength of the nucleophile has no effect on SN2 reactions. C) Only neutral nucleophiles can participate in SN2 reactions. D) A stronger nucleophile increases the rate of SN2 reactions. Show Answer Correct Answer: D) A stronger nucleophile increases the rate of SN2 reactions. 19. Which of the following is not the method of preparation of alkyl halide? A) Darzen's method. B) Halogenation of alkene. C) Addition of HX on alkenes. D) Hydration of alkene. Show Answer Correct Answer: D) Hydration of alkene. 20. Assertion (A):Hydrolysis of (-)-2-bromooctane proceeds with inversion of configuration.Reason (R):This reaction proceeds through the formation of a carbocation. A) Assertion and Reason both are correct and Reason is the correct explanation of Assertion. B) Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion. C) Assertion is correct but Reason is wrong. D) Assertion is wrong but Reason is correct. Show Answer Correct Answer: C) Assertion is correct but Reason is wrong. 21. What type of halides are formed when halogen atoms are bonded to sp2 hybridized carbon atoms? A) Alkyl halides. B) Allylic halides. C) Vinylic halides. D) Aryl halides. Show Answer Correct Answer: D) Aryl halides. 22. What is the IUPAC name for CH3CH2CH2Br? A) 1-bromopropane. B) 2-bromopropane. C) 1-chloropropane. D) 3-bromopropane. Show Answer Correct Answer: A) 1-bromopropane. 23. Elimination R-X (eliminate H+, X-not combined). base (OH-) attacks H atom adjacent to X. no intermediate.follow Zaitsev rule.example:2-chlorobuthane $\rightarrow$ 2-butene (major) + 1-butene (minor). 2-chlorobutane (-HCl) $\rightarrow$ CH3-CH=CH-CH3 (major) + CH3CH2CH=CH2 (minor) A) R-X + KOH (ethanolic, heat) $\rightarrow$ C=C + KX + H2O. B) R-X + KOH (ethanolic, heat) $\rightarrow$ ROH + KX. C) All the above. D) None of the above. Show Answer Correct Answer: A) R-X + KOH (ethanolic, heat) $\rightarrow$ C=C + KX + H2O. 24. Among the choice alkyl bromide, the least reactive bromide in S$_{N}$2 reaction A) 1-bromo-3-methylbutane. B) 1-bromopentane. C) 1-bromo-2-methylbutane. D) 2-bromo-2-methylbutane. Show Answer Correct Answer: D) 2-bromo-2-methylbutane. 25. What is the expected product when chlorobenzene undergoes nitration? A) Nitrobenzene. B) Ortho-nitrochlorobenzene and para-nitrochlorobenzene. C) Chloronitrobenzene. D) Benzene. Show Answer Correct Answer: B) Ortho-nitrochlorobenzene and para-nitrochlorobenzene. ← 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 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 10Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books