This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes – Quiz 15 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part Ii) Chapter 10 Haloalkanes And Haloarenes Quiz 15 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. How can aryl halides be prepared from diazonium salts? A) By reacting the diazonium salt with a strong acid. B) By treating the diazonium salt with a copper(I) halide (CuX) in the presence of a base. C) By mixing the diazonium salt with an alkali metal. D) By heating the diazonium salt with a reducing agent. Show Answer Correct Answer: B) By treating the diazonium salt with a copper(I) halide (CuX) in the presence of a base. 2. How do you name a haloarene with a bromine substituent on a benzene ring? A) Benzene-bromo. B) Bromo benzene or-bromobenzene. C) Bromobenzene. D) Bromo-benzene. Show Answer Correct Answer: B) Bromo benzene or-bromobenzene. 3. What is the IUPAC name for CH3CH2CH2CH2CH2CH2Cl? A) Chlorohexane. B) 6-chlorohexane. C) Hexane chloride. D) Hexyl chloride. Show Answer Correct Answer: D) Hexyl chloride. 4. Which of the following alkyl halides will undergoes S$_{N}$1 reaction most readily? A) (CH$_{3}$)$_{3}$C-F. B) (CH$_{3}$)$_{3}$C-Cl. C) (CH$_{3}$)$_{3}$C-Br. D) (CH$_{3}$)$_{3}$C-I. Show Answer Correct Answer: D) (CH$_{3}$)$_{3}$C-I. 5. Assertion:PCl3 &PCl5 are preferred over thionyl chloride for the preparation of alkylchloride from alcoholsReason:Phosphorous chlorides give pure alkyl halides A) A and R are correct statements, and R is the correct explanation of A. B) A and R are correct statements, but R is not the correct explanation of A. C) A is correct, B is incorrect statements. D) A is incorrect, R is correct statement. Show Answer Correct Answer: B) A and R are correct statements, but R is not the correct explanation of A. 6. Dichloroethane and 1, 2-dichloroethane are structural isomers. What are the products formed when both isomers are hydrolysed separately in dilute hydrochloric acid? A) HOCH$_{2}$CH$_{2}$OH and CH$_{3}$CHO. B) HOCH$_{2}$CH$_{2}$OH and CH$_{3}$CH(OH)$_{2}$. C) HOCH$_{2}$CH$_{2}$Cl and CH$_{3}$CHO. D) HOCH$_{2}$CH$_{2}$OH and CH$_{3}$CH(OH)Cl. Show Answer Correct Answer: A) HOCH$_{2}$CH$_{2}$OH and CH$_{3}$CHO. 7. What are haloarenes and how do they differ from haloalkanes? A) Haloarenes are non-aromatic compounds with halogen atoms. B) Haloalkanes contain only carbon and hydrogen without halogens. C) Haloarenes are aromatic compounds with halogen atoms attached to an aromatic ring, while haloalkanes are aliphatic compounds with halogen atoms attached to carbon atoms. D) Haloarenes are saturated compounds with halogen atoms. Show Answer Correct Answer: C) Haloarenes are aromatic compounds with halogen atoms attached to an aromatic ring, while haloalkanes are aliphatic compounds with halogen atoms attached to carbon atoms. 8. Which type of carbon atom in haloalkanes is sp3 hybridized? A) Vinylic carbon. B) Allylic carbon. C) Alkyl carbon. D) Aromatic carbon. Show Answer Correct Answer: C) Alkyl carbon. 9. Assertion:KCN reacts with methyl chloride to give methyl isocyanide.Reason:CN-is an ambidentate nucleophile. A) A. B) B. C) C. D) D. Show Answer Correct Answer: D) D. 10. Give an example of a reagent commonly used in the preparation of alkyl halides from alcohols. A) Sulfuric acid (H2SO4). B) Nitric acid (HNO3). C) Acetic acid (CH3COOH). D) Hydrochloric acid (HCl). Show Answer Correct Answer: D) Hydrochloric acid (HCl). 11. What is the impact of solvent polarity on the rate of SN1 and SN2 reactions? A) Polar protic solvents favor SN1 reactions, while polar aprotic solvents favor SN2 reactions. B) Solvent polarity has no effect on the rate of nucleophilic substitution reactions. C) Polar solvents increase the rate of both SN1 and SN2 reactions. D) Non-polar solvents are preferred for both SN1 and SN2 reactions. Show Answer Correct Answer: A) Polar protic solvents favor SN1 reactions, while polar aprotic solvents favor SN2 reactions. 12. Arrange the strength of van der Waals forces with same number of C atom (increasing): A) RF < RCl < RBr < RI. B) RF > RCl > RBr > RI. C) All the above. D) None of the above. Show Answer Correct Answer: A) RF < RCl < RBr < RI. 13. A Grignard reagent may be made by reacting magnesium with A) Methyl amine. B) Diethyl ether. C) Ethyl iodide. D) Ethyl alcohol. Show Answer Correct Answer: C) Ethyl iodide. 14. What is the IUPAC name for CH3Cl? A) Methanol. B) Methyl chloride. C) Chloromethane. D) Chloroethane. Show Answer Correct Answer: C) Chloromethane. 15. How does the leaving group affect the rate of nucleophilic substitution? A) A better leaving group decreases the rate of nucleophilic substitution. B) A better leaving group increases the rate of nucleophilic substitution. C) A worse leaving group increases the rate of nucleophilic substitution. D) The leaving group has no effect on the rate of nucleophilic substitution. Show Answer Correct Answer: B) A better leaving group increases the rate of nucleophilic substitution. 16. An alkyl halide with molecular formula, C$_{6}$H$_{5}$Br on dehydrohalogenation gives two isomeric alkenes X and Y with molecular formula, C$_{6}$H$_{12}$. On reductive ozonolysis X and Y gave four compounds CH$_{3}$COCH$_{3}$, CH$_{3}$CHO, CH$_{3}$CH$_{2}$CHO and (CH$_{3}$)$_{2}$CHCHO. The alkyl halide is A) 3-bromo-2-methylpentane. B) 2, 2-dimethyl-1-bromobutane. C) 4-bromo-2-methylpentane. D) 2-bomo-2, 3-dimethylbutane. Show Answer Correct Answer: A) 3-bromo-2-methylpentane. 17. The product when R-X react with grignard reagent (Mg/ dry ether): A) R-H (alkane). B) RMgX. C) Mg-X. D) R-X. Show Answer Correct Answer: B) RMgX. 18. In S$_{N}$2 reaction the sequence of bond breaking and bond formation is as follows A) Bond breaking and formation take place randomly. B) Bond formation is followed by breaking. C) Bond breaking followed by formation. D) Bond breaking and formation occur simultaneously. Show Answer Correct Answer: D) Bond breaking and formation occur simultaneously. 19. Assertion:The boiling points of haloalkanes increase with increasing molecular weight. Reason:This is due to increased van der Waals forces in larger molecules. A) The assertion is false, but the reason is true. B) The assertion is true, but the reason is false. C) Both the assertion and reason are true, and the reason correctly explains the assertion. D) Both the assertion and reason are false. Show Answer Correct Answer: C) Both the assertion and reason are true, and the reason correctly explains the assertion. 20. Which of the following is obtained by the reaction of chlorobenzene with ammonia under high pressure and temperature? A) Aniline. B) Nitrobenzene. C) Phenol. D) Benzamide. Show Answer Correct Answer: A) Aniline. 21. During the course of SN1 reaction, the intermediate species formed is A) A carbocation. B) A free radical. C) A carbanion. D) An intermediate. Show Answer Correct Answer: A) A carbocation. 22. Elimination of bromine from 2-bromobutane result in the formation of A) Predominantly 2-butene. B) Predominantly 2-butyne. C) Equimolar mixture of 1 and 2-butene. D) Predominantly 1-butene. Show Answer Correct Answer: A) Predominantly 2-butene. 23. SN$^{2}$ reaction involves the formation of ..... intermediate A) Carbocation. B) Carboanion. C) Transition state. D) None of these. Show Answer Correct Answer: C) Transition state. 24. What is a racemic mixture? A) Mixture of 2 dextro enantiomers. B) Mixture of dextro & laevo enantiomers. C) Mixture of chiral molecules. D) Mixture of 2 laevo enantiomers. Show Answer Correct Answer: B) Mixture of dextro & laevo enantiomers. 25. The number of isomers (including structural and stereoisomers) of C$_{4}$H$_{9}$Cl is A) 2. B) 3. C) 4. D) 5. 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