This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Why chloroform is stored in closed dark coloured bottles?? A) Chloroform is very poisonous. B) Chloroform causes damage to CNS, liver, kidneys. C) Chloroform is a very reactive gas. D) Chloroform is oxidised by air to phosgene. Show Answer Correct Answer: D) Chloroform is oxidised by air to phosgene. 2. Ambident nucleophile is A) CN. B) H2O. C) Cl. D) NH2. Show Answer Correct Answer: A) CN. 3. What is a common application of haloalkanes in the pharmaceutical industry? A) Solvent for chemical reactions. B) Preservative in food products. C) Fuel for combustion engines. D) Synthesis of pharmaceuticals. Show Answer Correct Answer: D) Synthesis of pharmaceuticals. 4. Classify the following compounds as primary, secondary and tertiary halides.i) 1-Bromobut-2-eneii) 4-Bromopent-2-eneiii) 2-Bromo-2-methylpropane A) (i) secondary, (ii) tertiary, (iii) primary. B) (i)primary, (ii) secondary, (iii) tertiary. C) (i) secondary, (ii) primary, (iii) tertiary. D) (i)primary, (ii) tertiary, (iii) secondary. Show Answer Correct Answer: B) (i)primary, (ii) secondary, (iii) tertiary. 5. What is the trend of bond polarity in haloalkanes and haloarenes? A) I > Br > Cl > F. B) F > Cl > Br > I. C) Cl > F > Br > I. D) Br > I > Cl > F. Show Answer Correct Answer: B) F > Cl > Br > I. 6. What is the effect of increasing the number of halogen substituents on the stability of haloalkanes? A) Stability remains unchanged regardless of halogen number. B) Stability decreases with more halogen substituents. C) Stability is only affected by the type of halogen present. D) Stability increases with more halogen substituents. Show Answer Correct Answer: B) Stability decreases with more halogen substituents. 7. What is the effect of temperature on nucleophilic substitution reactions? A) Higher temperatures decrease reaction rates. B) Increasing temperature generally increases the rate of nucleophilic substitution reactions, but very high temperatures may lead to side reactions. C) Increasing temperature always leads to more favorable products. D) Temperature has no effect on nucleophilic substitution reactions. Show Answer Correct Answer: B) Increasing temperature generally increases the rate of nucleophilic substitution reactions, but very high temperatures may lead to side reactions. 8. Which of the reaction follows Markonikovs rule A) C$_{2}$H$_{4}$ + HBr. B) C$_{3}$H$_{6}$ + Cl$_{2}$. C) C$_{3}$H$_{6}$ + HBr. D) C$_{3}$H$_{6}$ + Br$_{2}$. Show Answer Correct Answer: C) C$_{3}$H$_{6}$ + HBr. 9. The negative part of the addendum ( the molecule to be added) adds on to the carbon atom of the double bond containing the least number of hydrogen atoms. This rule is known as A) Saytzeff's rule. B) Hoffmann rule. C) Peroxide rule. D) Markovnikov's rule. Show Answer Correct Answer: D) Markovnikov's rule. 10. What is Lucas Reagent? A) Conc HCl + And. FeCl3. B) Conc HCl + And. ZnCl2. C) Conc HCl + And. AlCl3. D) Conc HBr + And. FeCl3. Show Answer Correct Answer: B) Conc HCl + And. ZnCl2. 11. Alkyl halides are immiscible in water though they are polar because A) C-X bond cannot be broken easily. B) They react with water to give alcohols. C) They are stable compounds are not reactive. D) They cannot form hydrogen bonds with water. Show Answer Correct Answer: D) They cannot form hydrogen bonds with water. 12. What is the role of a catalyst in the preparation of haloarenes? A) The catalyst is used to remove impurities from haloarenes. B) A catalyst is necessary for the formation of haloarenes without any reaction. C) A catalyst decreases the reaction rate of haloarenes. D) The role of a catalyst is to increase the reaction rate and yield of haloarenes by facilitating electrophilic substitution. Show Answer Correct Answer: D) The role of a catalyst is to increase the reaction rate and yield of haloarenes by facilitating electrophilic substitution. 13. Fitting reaction can be used to prepare A) Toluene. B) Acetophenon. C) Diphenyl. D) Chlorobenzene. Show Answer Correct Answer: A) Toluene. 14. Chloroethane, chlorobenzene, (chloromethyl)benzene All three organic substances above can react with A) Bromine water at room temperature. B) Acidified potassium dichromate under reflux. C) Aqueous solution of sodium hydroxide at room temperature. D) Magnesium in dry ether. Show Answer Correct Answer: D) Magnesium in dry ether. 15. What is the stereochemical outcome of an SN2 reaction? A) Formation of a racemic mixture. B) Inversion of configuration at the chiral center. C) No change in stereochemistry. D) Retention of configuration at the chiral center. Show Answer Correct Answer: B) Inversion of configuration at the chiral center. 16. Which of the following species is/are nucleophile(s)? I. OH$^{-}$ II. H$_{2}$OIII. R$_{3}$C$^{-}$ 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. 17. Chlorobenzene is formed by reaction of chlorine with benzene in the presence of AlCl$_{3}$ . Whichof the following species attacks the benzene ring in this reaction? A) Cl$^{-}$. B) Cl$^{+}$. C) AlCl$_{3}$. D) [AlCl$_{4}$ ]$^{-}$. Show Answer Correct Answer: B) Cl$^{+}$. 18. Which halogen atom size increases the most in haloalkanes? A) Fluorine. B) Chlorine. C) Bromine. D) Iodine. Show Answer Correct Answer: D) Iodine. 19. Which of the following compounds will have highest melting point? A) M-dicholorbenzene. B) Chlorobenzene. C) P-dichlorobenzene. D) O-dichlorobenzene. Show Answer Correct Answer: C) P-dichlorobenzene. 20. What are the common methods for preparing haloarenes? A) Hydrogenation of haloarenes. B) Common methods for preparing haloarenes include halogenation of arenes, nucleophilic substitution, electrophilic aromatic substitution, Sandmeyer reaction, and Finkelstein reaction. C) Oxidation of haloarenes. D) Dehydrohalogenation of haloalkanes. Show Answer Correct Answer: B) Common methods for preparing haloarenes include halogenation of arenes, nucleophilic substitution, electrophilic aromatic substitution, Sandmeyer reaction, and Finkelstein reaction. 21. How do you prepare haloalkanes from alcohols? A) Haloalkanes are formed by heating alcohols with water. B) Haloalkanes can be synthesized by oxidizing alcohols with oxygen. C) Haloalkanes are prepared from alcohols by reacting them with hydrogen halides or phosphorus halides. D) Haloalkanes are produced by mixing alcohols with sodium chloride. Show Answer Correct Answer: C) Haloalkanes are prepared from alcohols by reacting them with hydrogen halides or phosphorus halides. 22. What is the main difference between haloalkanes and haloarenes? A) Haloalkanes have halogens attached to saturated carbons, while haloarenes have halogens attached to aromatic rings. B) Haloalkanes are always liquid, while haloarenes are always solid. C) Haloalkanes are more reactive than haloarenes due to their structure. D) Haloalkanes contain only carbon and hydrogen, while haloarenes contain oxygen. Show Answer Correct Answer: A) Haloalkanes have halogens attached to saturated carbons, while haloarenes have halogens attached to aromatic rings. 23. The order of reactivity of various alkyl halides towards nucleopilic substitution follows the order A) R-Cl>R-Br>R-I>R-F. B) R-I>R-Br>R-Cl>R-F. C) R-Br>R-I>R-Cl>R-F. D) R-F>R-Cl>R-Br>R-I. Show Answer Correct Answer: B) R-I>R-Br>R-Cl>R-F. 24. Tertiary butyl bromide on reaction with Na methoxide mainly gives A) Propene. B) Tert-butyl ethyl ether. C) Iso-propyl alcohol. D) 2-methylpropene. Show Answer Correct Answer: D) 2-methylpropene. 25. How do polar protic solvents affect SN1 and SN2 reactions? A) Polar protic solvents favor SN1 reactions and hinder SN2 reactions. B) Polar protic solvents have no effect on SN1 or SN2 reactions. C) Polar protic solvents only affect the rate of SN2 reactions. D) Polar protic solvents favor SN2 reactions and hinder SN1 reactions. Show Answer Correct Answer: A) Polar protic solvents favor SN1 reactions and hinder SN2 reactions. 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