This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 4 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A dihalogen derivative 'X' of a hydrocarbon with three carbon atoms react with ale. KOH and produces hydrocarbon which forms red ppt. with ammonical Cu2Cl2. 'X' gives an aldehyde on reaction with aq. KOH. The compound 'X' is A) 1, 3-Dichloropropane. B) 1, 2-Dichloropropane. C) 2, 2-Dichloropropane. D) 1, 1-Dichloropropane. Show Answer Correct Answer: D) 1, 1-Dichloropropane. 2. Alkyl halides react with metallic sodium in dry ether producing A) Alkanes with double the no. of carbon atoms. B) Alkenes with same no. of carbon atoms. C) Alkanes with same no. of carbon atoms. D) Alkenes with triple the no. of carbon atoms. Show Answer Correct Answer: A) Alkanes with double the no. of carbon atoms. 3. Which haloalkane is most reactive in nucleophilic substitution reactions? A) Tertiary haloalkanes. B) Alkyl halides. C) Secondary haloalkanes. D) Primary haloalkanes. Show Answer Correct Answer: A) Tertiary haloalkanes. 4. How do you name a haloalkane with a branched chain? A) Ignore halo groups when naming. B) Count all carbon atoms in the molecule. C) Use only the longest branch for naming. D) Identify the longest chain, number it, name halo groups and branches, combine into a single name. Show Answer Correct Answer: D) Identify the longest chain, number it, name halo groups and branches, combine into a single name. 5. Haloalkanes also called A) Alkyl halides. B) Vinylic halides. C) All the above. D) None of the above. Show Answer Correct Answer: A) Alkyl halides. 6. The rate of reaction for SN$^{2 }$reactions is A) Rate = k [RX] [Nucleophile]. B) Rate= k[RX]. C) All the above. D) None of the above. Show Answer Correct Answer: A) Rate = k [RX] [Nucleophile]. 7. Which factor affects the reactivity of haloalkanes in nucleophilic substitution reactions? A) All of the above. B) The nature of the solvent used. C) The type of halogen present. D) The size of the alkyl group. Show Answer Correct Answer: A) All of the above. 8. Which of the following is a primary haloalkane? A) Pentane. B) Bromoethane. C) Chlorobutane. D) Iodopropane. Show Answer Correct Answer: B) Bromoethane. 9. In SN2 reactions the sequence of bond breaking and bond formation is as follows A) Nucleophile attacks the carbon from opposite side. B) The bond formation and bond breaking takes place simultaneously. C) The rate of reaction depends on the concentration of nucleophile. D) Sn2 mechanism is predominant in tertiary alkyl halide. Show Answer Correct Answer: B) The bond formation and bond breaking takes place simultaneously. 10. What ester is formed when ethanoic acid reacts with methanol? A) Methy ethyl ester. B) Ethyl methanoate. C) Methyl ethanoate. D) Propanoic ester. Show Answer Correct Answer: C) Methyl ethanoate. 11. What role does the solvent play in nucleophilic substitution reactions? A) The solvent changes the color of the reactants during the reaction. B) The solvent stabilizes the transition state and affects nucleophilicity. C) The solvent acts as a catalyst in the reaction. D) The solvent increases the reaction rate by providing heat. Show Answer Correct Answer: B) The solvent stabilizes the transition state and affects nucleophilicity. 12. Butanate nitrile can be prepared by heating A) Butyl alcohol with KCN. B) Propyl alcohol with KCN. C) Propyl chloride with KCN. D) Butyl chloride with KCN. Show Answer Correct Answer: C) Propyl chloride with KCN. 13. Triiodomethane has antiseptic property because of A) Formation of phosgene gas. B) Liberation of iodoform. C) Liberation of free iodine. D) None of these. Show Answer Correct Answer: C) Liberation of free iodine. 14. What are some common examples of haloalkanes? A) Isopropyl alcohol. B) Methyl chloride, ethyl bromide, isopropyl iodide. C) Ethyl alcohol. D) Methyl acetate. Show Answer Correct Answer: B) Methyl chloride, ethyl bromide, isopropyl iodide. 15. Consider the following s$_{N}$2 reactionsI. RX+Y$^{-}$ R-Y+X$^{-}$II. RX+Y R-Y$^{+}$+X$^{-}$III. RX$^{+}$+Y$^{-}$ R-Y+XIV. RX$^{+}$+Y R-Y$^{+}$+XIn which reactions there is large increase and large decrease n rate if reaction respectively with increase in polarity of the solvent? A) II &III. B) II&IV. C) I&IV. D) IV&I. Show Answer Correct Answer: A) II &III. 16. What are the reaction conditions for wurtz-fittig reaction? A) Na + dry ether. B) Na + aq.NaOH. C) Na in acidic medium. D) Na in conc.HCl. Show Answer Correct Answer: A) Na + dry ether. 17. Haloalkanes contains halogen atom(s) attached to the sp$^{3}$ hybridised carbon atom of an alkyl group. Identify haloalkane from the following compounds.(i) 2-Bromopentane(ii) Vinyl chloride(iii) 2-Chloroacetophenone(iv) Trichloromethane A) Only (i) and (iv). B) Only (ii) and (iv). C) (ii) only. D) Only (i), (ii) and (iii). Show Answer Correct Answer: A) Only (i) and (iv). 18. During Friedal crafts acetylation, the major product formed is A) P-Chloroacetophenone. B) O-chloroacetophenone. C) M-chloroacetophenone. D) Dichloroacetophenone. Show Answer Correct Answer: A) P-Chloroacetophenone. 19. The number of structural isomers of formula C$_{4}$H$_{9}$Br is ..... A) 2. B) 3. C) 4. D) 5. Show Answer Correct Answer: C) 4. 20. What determines the stereochemistry outcome of S N 2 reactions? A) No change. B) Inversion. C) Racemization. D) Retention. Show Answer Correct Answer: B) Inversion. 21. What is the rate dependency of S N 1 reactions? A) First order. B) Second order. C) Zero order. D) Variable order. Show Answer Correct Answer: A) First order. 22. What is the role of resonance in the reactivity of haloarenes? A) Resonance has no effect on the stability or reactivity of haloarenes. B) Halogens enhance the reactivity of haloarenes through resonance effects. C) Resonance increases the reactivity of haloarenes by stabilizing the negative charge. D) Resonance stabilizes haloarenes but decreases their reactivity due to electron-withdrawing effects of halogens. Show Answer Correct Answer: D) Resonance stabilizes haloarenes but decreases their reactivity due to electron-withdrawing effects of halogens. 23. What is the primary product when 1-bromopropane reacts with sodium hydroxide? A) 1-bromopropane. B) Propanol. C) Sodium bromide. D) Propane. Show Answer Correct Answer: B) Propanol. 24. What are the health effects associated with exposure to halogenated compounds? A) Enhanced skin health. B) Increased fertility rates. C) Improved respiratory function. D) Health effects include respiratory issues, skin irritation, endocrine disruption, carcinogenic potential, liver and kidney damage, neurological effects, and reproductive issues. Show Answer Correct Answer: D) Health effects include respiratory issues, skin irritation, endocrine disruption, carcinogenic potential, liver and kidney damage, neurological effects, and reproductive issues. 25. Ethylmagnesium chloride is an example of Grignard reagent. It may be used to prepare A) Ethene. B) Ethanol. C) 1-propanol. D) Ethanoic acid. Show Answer Correct Answer: C) 1-propanol. ← 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 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