This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes – Quiz 13 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 13 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. How does the polarity of the C-X bond in haloarenes compare to that in haloalkanes? A) More polar. B) Less polar. C) Equally polar. D) Not polar. Show Answer Correct Answer: B) Less polar. 2. What is the significance of the transition state in SN2 reactions? A) The transition state is significant as it determines the activation energy and influences the reaction rate and stereochemistry in SN2 reactions. B) The transition state has no effect on the reaction rate. C) The transition state is a stable intermediate in the reaction. D) The transition state is only relevant in SN1 reactions. Show Answer Correct Answer: A) The transition state is significant as it determines the activation energy and influences the reaction rate and stereochemistry in SN2 reactions. 3. Which effect is responsible for the partial double bond character in the C-X bond of haloarenes? A) Inductive effect. B) Hyperconjugation. C) Resonance effect. D) Electromeric effect. Show Answer Correct Answer: C) Resonance effect. 4. What is the effect of halogen substituents on the acidity of aromatic compounds? A) Halogen substituents decrease the acidity of aromatic compounds. B) Halogen substituents have no effect on the acidity of aromatic compounds. C) Halogen substituents make aromatic compounds more basic. D) Halogen substituents increase the acidity of aromatic compounds. Show Answer Correct Answer: D) Halogen substituents increase the acidity of aromatic compounds. 5. An organic halogen compound which is used as refrigerant in refrigerators and ac is A) BHC. B) CHCl$_{3}$. C) CCl$_{4}$. D) Freon. Show Answer Correct Answer: D) Freon. 6. Assertion:Haloarenes are less reactive than haloalkanes. Reason:The resonance stabilization in haloarenes decreases their reactivity. A) Haloarenes and haloalkanes have the same reactivity. B) Haloarenes are more reactive than haloalkanes. C) True. D) The resonance stabilization in haloalkanes increases their reactivity. Show Answer Correct Answer: C) True. 7. Preparation of Haloalkane (R-X): A) Using alkane with bromonation & UV (Br$_{2}$/UV). B) Using alkene with present of hydrogen bromide (HBr). C) Substitusion R-OH with PBr$_{3}$. D) All above. Show Answer Correct Answer: D) All above. 8. 1-chlorobutane reacts with alcoholic potash to give A) 1-butanol. B) But-1ene. C) But-2-ene. D) None of the above. Show Answer Correct Answer: B) But-1ene. 9. How would you classify 2-bromopropane as a haloalkane? A) Primary. B) Secondary. C) Tertairy. D) Methyl. Show Answer Correct Answer: B) Secondary. 10. Which of the following alkyl halides undergoes hydrolysis with aqueous KOH at the fastest rate? A) CH$_{3}$CH$_{2}$CH(Br)CH$_{3}$. B) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$Cl. C) CH$_{3}$CH$_{2}$CH$_{2}$Cl. D) CH$_{3}$CH$_{2}$Cl. Show Answer Correct Answer: A) CH$_{3}$CH$_{2}$CH(Br)CH$_{3}$. 11. Identify the compound Y in the following reactionC$_{6}$H$_{5}$NH$_{2}$ + NaNO$_{2}$ + HCl ..... $_{0-5}$0$_{ C}$$\rightarrow$C$_{6}$H$_{5}$N$_{2}$$^{+}$Cl$^{-}$ + Cu$_{2}$Cl$_{2 }$/ HCl $\rightarrow$ Y + N$_{2}$ A) Benzene. B) Chloro benzene. C) 1, 3-Dichloro benzene. D) 1, 4-Dichloro benzene. Show Answer Correct Answer: B) Chloro benzene. 12. What is the effect of solvent on the rate of nucleophilic substitution reactions? A) Polar protic solvents always increase the reaction rate. B) The solvent affects the rate of nucleophilic substitution reactions by stabilizing reactants and transition states, influencing nucleophilicity. C) Nucleophilicity is solely determined by the substrate. D) The solvent has no effect on the reaction rate. Show Answer Correct Answer: B) The solvent affects the rate of nucleophilic substitution reactions by stabilizing reactants and transition states, influencing nucleophilicity. 13. What is the role of a nucleophile in a nucleophilic substitution reaction? A) Nucleophiles inhibit the formation of new bonds in the reaction. B) Nucleophiles act as catalysts in the reaction. C) The role of a nucleophile is to accept electrons from the substrate. D) The role of a nucleophile in a nucleophilic substitution reaction is to donate a pair of electrons to form a new bond with the substrate. Show Answer Correct Answer: D) The role of a nucleophile in a nucleophilic substitution reaction is to donate a pair of electrons to form a new bond with the substrate. 14. An alkyl halide RX reacts with KCN to give propane nitrile RX is A) C$_{3}$H$_{7}$Br. B) C$_{5}$H$_{11}$Br. C) C$_{4}$H$_{9}$Br. D) C$_{2}$H$_{5}$Br. Show Answer Correct Answer: D) C$_{2}$H$_{5}$Br. 15. The compound ethylisocyanide is prepared by the reaction between: A) C$_{2}$H$_{5}$Br and KCN. B) C$_{2}$H$_{5}$Br and AgCN. C) C$_{2}$H$_{5}$Br and HCN. D) C$_{2}$H$_{5}$Br and ammonia. Show Answer Correct Answer: B) C$_{2}$H$_{5}$Br and AgCN. 16. What is the difference between SN1 and SN2 mechanisms? A) SN2 requires a carbocation intermediate. B) SN1 involves a two-step mechanism with a carbocation intermediate, while SN2 involves a one-step concerted mechanism. C) SN1 is always faster than SN2. D) SN1 occurs in a single step without intermediates. Show Answer Correct Answer: B) SN1 involves a two-step mechanism with a carbocation intermediate, while SN2 involves a one-step concerted mechanism. 17. Among the isomers of C$_{6}$H$_{11}$Cl, the one which is chiral isi) 2, 2-dimethyl-1-chloropropaneii) 2-chloropentaneiii) 2-methyl-2-chlorobutaneiv) 3-chloopentane A) (i), (ii) and (iii) only. B) (i) and (iii) only. C) (ii) only. D) (i) and (ii) only. Show Answer Correct Answer: C) (ii) only. 18. The fire extinguisher 'pyrene' contains A) Chloroform. B) Carbon di oxide. C) Carbon tetrachloride. D) Carbon disulphide. Show Answer Correct Answer: C) Carbon tetrachloride. 19. When excess chlorine is used in electrophilic substitution of toluene, which of the following dichloroarenes are formed? A) Ortho and meta. B) Ortho and para. C) Meta and para. D) Ortho, meta and para. Show Answer Correct Answer: B) Ortho and para. 20. Which of the following compounds has the highest boiling points? A) CH3CH2CH2Cl. B) CH3CH2CH2CH2Cl. C) CH3CH(CH3)CH2Cl. D) None of the above. Show Answer Correct Answer: B) CH3CH2CH2CH2Cl. 21. What is the effect of the carbon chain length on the boiling point of haloalkanes? A) The boiling point of haloalkanes decreases with increasing carbon chain length. B) The boiling point of haloalkanes remains constant regardless of carbon chain length. C) The boiling point of haloalkanes is unaffected by carbon chain length. D) The boiling point of haloalkanes increases with increasing carbon chain length. Show Answer Correct Answer: D) The boiling point of haloalkanes increases with increasing carbon chain length. 22. Which of the following compounds is a secondary haloalkane? A) CH3CH2Br. B) (CH3)2CHBr. C) CH3Br. D) CH3CCl3. Show Answer Correct Answer: B) (CH3)2CHBr. 23. The position of-Br in the compound in CH3CH=CHC(Br)(CH3 ) 2 can be classified as ..... A) (i) Allyl. B) (ii) Aryl. C) (iii) Vinyl. D) (iv) Secondary. Show Answer Correct Answer: A) (i) Allyl. 24. Reaction with alcoholic potassium cyanide. (Chloromethyl)benzene + KCN $\rightarrow$ benzylnitrile (have one extra C, increase chain length by one C) + KX A) R-X + KCN (alcoholic, heat) $\rightarrow$ R-CN (Nu-:CN) + KX. B) R-X + KCN (alcoholic, heat) $\rightarrow$ RKCN + HX. C) All the above. D) None of the above. Show Answer Correct Answer: A) R-X + KCN (alcoholic, heat) $\rightarrow$ R-CN (Nu-:CN) + KX. 25. Which haloarene is used as a solvent in chemical reactions? A) Chlorobenzene. B) Fluorobenzene. C) Bromobenzene. D) Iodobenzene. Show Answer Correct Answer: A) Chlorobenzene. ← 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