MCQ Question for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes

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Haloalkanes and Haloarenes Class 12 MCQ Chemistry with answers

Refer below for MCQ Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with solutions. Solve questions and compare with the answers provided below

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

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

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

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

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

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

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

Question. 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     

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

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

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

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

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

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

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

Question. 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. 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. 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. 

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

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

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

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