Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes MCQ Questions with Answers

Class 12 Haloalkanes and Haloarenes MCQ is one of the best strategies to prepare for the CBSE Class 12 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more MCQ questions on Haloalkanes and Haloarenes Class 12 which will help them all through their board test.

Class 12 Haloalkanes and Haloarenes MCQ with answers

Class 12 Chemistry MCQ with answers are given here to chapter Haloalkanes and Haloarenes . These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 12 Chemistry syllabus. By Solving these Class 12 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 12 Annual exam.

Learn Haloalkanes and Haloarenes Class 12 MCQ with answers PDF with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving Class 12 Haloalkanes and Haloarenes MCQs with answers pdf given below.

Question 1. Elimination reaction of 2-bromopentane to form pent-2-ene is
(A) b-Elimination reaction
(B) Follows Zaitsev rule
(C) Dehydrohalogenation reaction
(D) Dehydration reaction
(a) (A), (B), (C)
(b) (A), (C), (D)
(c) (B), (C), (D)
(d) (A), (B), (D)

Question 2. The reaction of C₆H₅CH CHCH₃ with HBr produces
(a) C₆H₅CH₂CH₂CH₂Br
The reaction will be most favourable if M happens to be
(a) Na
(b) K
(c) Rb
(d) Li 

Question 3. When chlorine is passed through propene at 400°C,which of the following is formed?
(a) PVC
(b) Allyl chloride
(c) Propyl chloride
(d) 1, 2-Dichloroethane

Question 4. The compound C7H8 undergoes the following reactions :
The product C is
(a) m-bromotoluene
(b) o-bromotoluene
(c) 3-bromo-2,4,6-trichlorotoluene
(d) p-bromotoluene.

Question 5. Consider the reaction, CH₃CH₂CH₂Br + NaCN →CH₃CH₂CH₂CN + NaBr
This reaction will be the fastest in
(a) ethanol
(b) methanol
(c) N, N -dimethylformamide (DMF)
(d) water.

Question 6. The compound A on treatment with Na gives B, and with PCl₅ gives C. B and C react together to give diethyl ether. A, B and C are in the order
(a) C₂H₅OH, C₂H₆, C₂H₅Cl
(b) C₂H₅OH, C₂H₅Cl, C₂H₅ ONa
(c) C₂H₅Cl, C₂H₆, C₂H₅ OH
(d) C₂H₅OH, C₂H₅ONa, C₂H₅ Cl

Question 7. Which of the following acids does not exhibit optical isomerism?
(a) Maleic acid
(b) a-Amino acids
(c) Lactic acid
(d) Tartaric acid

Question 8. Two possible stereo-structures of CH₃CHOHCOOH,which are optically active, are called
(a) atropisomers
(b) enantiomers
(c) mesomers
(d) diastereomers. 

Question 9. In an SN₁ reaction on chiral centres, there is
(a) inversion more than retention leading to partial racemisation
(b) 100% retention
(c) 100% inversion
(d) 100% racemisation.

Question 10. Which of the following reactions is an example of nucleophilic substitution reaction?
(a) 2RX + 2Na R – R + 2NaX
(b) RX + H₂ RH + HX
(c) RX + Mg RMgX
(d) RX + KOH ROH + KX

Question 11. Among the following which one has weakest carbon-halogen bond? 
(a) Benzyl bromide
(b) Bromobenzene
(c) Vinyl bromide
(d) Benzyl chloride     

Question 12. Which one is most reactive towards SN1 reaction?
(a) C₆H₅CH(C₆H₅)Br
(b) C₆H₅CH(CH₃)Br
(c) C₆H₅C(CH₃)(C6H₅)Br
(d) C₆H₅CH₂Br

Question 13. The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is
(a) gammexane
(b) DDT
(c) freon
(d) hexachloroethane       

Question 14. X →_HNO3^AgNO3 yellow or white ppt Which of the following cannot be X? 

Question 15. Which one of the following chlorohydrocarbons readily undergoes solvolysis ?

Question 16. The reaction of toluene with Cl₂ in presence of FeCl₃ gives predominantly
(a) benzoyl chloride
(b) benzyl chloride
(c) o and p-chlorotoluene
(d) m-chlorotoluene     

Question 17. Fluorobenzene (C₆H₅F) can be synthesised in the laboratory
(a) by heating phenol with HF and KF 
(b) from aniline by diazotisation followed by heating the diazonium salt with HBF₄
(c) by direct tluorination of benzene with F₂ gas
(d) by reacting bromobenzene with NaF solution         

Question 18. Which of the following statements about benzyl chloride is incorrect? 
(a) It is less reactive than alkyl halides
(b) It can be oxidised to benzaldehyde by boiling with copper nitrate solution
(c) It is a lachrymatory liquid and answers Beilstein’s test
(d) It gives a white precipitate with alcoholic silver nitrate     

Question 19. Chlorobenzene gives aniline with 
(a) NH₃/Cu₂O
(b) NH₃/H₂SO₄
(c) NaNH₂
(d) None of these         

Question 20. Chlorination of toluene in the presence of light and heat followed by treatment with aqueous NaOH gives
(a) o-cresol 
(b) p-cresol
(c) mixture of o-cresol and p-Cresol
(d) benzoic acid
(e) 1, 3, 5-trihydroxy toluene     

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Question 21. Decomposition of benzene diazonium chloride by using Cu₂Cl₂ / HCI to form chlorobenzene is 
(a) Raschig reaction
(b) Sandmeyer’s reaction
(c) Kolbe’s reaction
(d) Cannizzaro’s reaction     

Question 22. Which of the following is not chiral?
(a) 2-Hydroxypropanoic acid
(b) 2-Butanol
(c) 2,3-Dibromopentane
(d) 3-Bromopentane

Question 23. Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?
(a) Ethyl chloride
(b) Isopropyl chloride
(c) Chlorobenzene
(d) Benzyl chloride

Question 24 . How many stereoisomers does this molecule have? CH3CH CHCH2CHBrCH3
(a) 8
(b) 2
(c) 4
(d) 6

Question 25. If there is no rotation of plane polarised light by a compound in a specific solvent, though to be chiral, it may mean that
(a) the compound is certainly meso
(b) there is no compound in the solvent
(c) the compound may be a racemic mixture
(d) the compound is certainly a chiral.

Question 26. obtained by chlorination of n-butane will be
(a) meso form
(b) racemic mixture
(c) d-form
(d) l-form. 

Question 27. Which of the following is least reactive in a nucleophilic substitution reaction?
(a) (CH₃)₃C – Cl
(b) CH₂ = CHCl
(c) CH₃CH₂Cl
(d) CH₂ = CHCH₂Cl

Question 28. Reactivity order of halides for dehydrohalogenation is
(a) R – F > R – Cl > R – Br > R – I
(b) R – I > R – Br > R – Cl > R – F
(c) R – I > R – Cl > R – Br > R – F
(d) R – F > R – I > R – Br > R – Cl

Question 29. A compound of molecular formula C₇H₁₆ shows optical isomerism, compound will be
(a) 2,3-dimethylpentane
(b) 2,2-dimethylbutane
(c) 2-methylhexane
(d) none of these. 

Question 30. Which of the following compounds is not chiral?
(a) CH₃CHDCH₂Cl
(b) CH₃CH₂CHDCl
(c) DCH₂CH₂CH₂Cl
(d) CH₃CHClCH₂D

Question 31. An organic compound A(C4H9Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then, A is
(a) t-butyl chloride
(b) s-butyl chloride
(c) iso-butyl chloride
(d) n-butyl chloride.

Question 32. Replacement of Cl of chlorobenzene to give phenol requires drastic conditions. But chlorine of 2,4-dinitrochlorobenzene is readily replaced because
(a) NO₂ donates e– at meta position
(b) NO₂ withdraws e– from ortho/para positions
(c) NO₂ makes ring electron rich at ortho and para
(d) NO₂ withdraws e– from meta position.

Question 33. Grignard reagent is prepared by the reaction between
(a) magnesium and alkane
(b) magnesium and aromatic hydrocarbon
(c) zinc and alkyl halide
(d) magnesium and alkyl halide. 

Question 34. Chlorobenzene reacts with Mg in dry ether to give a compound (A) which further reacts with ethanol to yield
(a) phenol
(b) benzene
(c) ethyl benzene
(d) phenyl ether. 

Question 35. The alkyl halide is converted into an alcohol by
(a) elimination
(b) dehydrohalogenation
(c) addition
(d) substitution.

Question 36. Reaction of t-butyl bromide with sodium methoxide produces
(a) sodium t-butoxide
(b) t-butyl methyl ether
(c) isobutane
(d) isobutylene.

Question 37. Benzene reacts with n-propyl chloride in the presence of anhydrous AlCl₃ to give
(a) 3-propyl-1-chlorobenzene
(b) n-propylbenzene
(c) no reaction
(d) isopropylbenzene. 

Question 38. Phosgene is a common name for
(a) phosphoryl chloride
(b) thionyl chloride
(c) carbon dioxide and phosphine
(d) carbonyl chloride.

Question 39. Which of the following is an optically active compound?
(a) 1-Butanol
(b) 1-Propanol
(c) 2-Chlorobutane
(d) 4-Hydroxyheptane

Question 40. Industrial preparation of chloroform employs acetone and
(a) phosgene
(b) calcium hypochlorite
(c) chlorine gas
(d) sodium chloride. 

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