CBSE Class 12 Chemistry Haloalkanes And Haloarenes Question Bank Set B

Question: Which of the following is not an allylic halide?
a) 5-bromo pent-1-ene
b) 4-bromopent-2-ene
c) 3-bromo-2-methylbut-1-ene
d) 1-bromobut-2-ene

Answer: a

Question: When a primary aromatic amine dissolved in cold aqueous mineral acid (HCl) is treated with sodium nitrite, the product formed is
a) aryl halide
b) diazonium salt
c) 2° aromatic amine
d) None of these

Answer: b

Question: Among the following, the suitable reagent for Wurtz reaction is
a) Na/alcohol
b) Na/ether
c) Zn/ether
d) Zn/alcohol

Answer: b

Question: Which of the following is an example of vic-dihalide?
a) Dichloromethane
b) 1,2-dichloroethane
c) Ethylidine chloride
d) Allyl chloride

Answer: b

Question: Which of the following is best for preparation of alkyl halides?
a) Alcohol
b) Alkene
c) Alkane
d) Alkyne

Answer: a

Question: Which of the following is benzyl halogen compound?
a) Br —C₆H₄CH(CH₃)CH₂CH₃
b) (CH₃)₃CCH₂CH(Br)C₆H₅
c) (CH₃)₂CHCH(Cl)CH₃
d) None of the above

Answer: b

Question: Which of the following is used to prepare alkyl chloride in presence of alcohol?
a) H₂SO₄
b) HCl solution (dilute)
c) dry HCl gas
d) None of these

Answer: c

Question: Which of the following reaction(s) is not given by haloalkanes?
a) Nucleophilic substitution reactions
b) Elimination reaction
c) Reaction with metals
d) Addition reactions

Answer: d

Question: Which of the following has no dipole moment?
a) CH₃Cl 
b) CHCl₃
c) CH₂Cl₂
d) CCl₄

Answer: d

Question: Which of the following has the highest melting point but least solubility in a given solvent?
a) o-dichlorobenzene
b) p-dichlorobenzene
c) m-dichlorobenzene
d) chlorobenzene

Answer: b

Question: What is the nature of KCN and AgCN compounds?
a) Ionic and covalent
b) Ionic and ionic
c) Covalent and ionic
d) Covalent and covalent

Answer: a

Question: The alkane that gives only one monochloro product on chlorination with Cl₂ in presence of diffused sunlight is
a) 2, 2-dimethylbutane
b) neo-pentane
c) n-pentane
d) isopentane

Answer: b

Question: The correct order of reactivity of alkyl halides toward S_N1  is as follows.
a) 2° halide > 3° halide > 1° halide > CH₃X
b) 3° halide > 1° halide > 2° halide > CH₃X
c) 3° halide > 2° halide > 1° halide > CH₃X
d) CH₃X > 1° halide > 2° halide > 3° halide

Answer: c

Question: When freon is manufactured by tetrachloromethane, the reaction involved in this process is called
a) Sandmeyer reaction
b) Swarts reaction
c) Finkelstein reaction
d) All of these

Answer: b

Question: The allylic and benzylic halides follow
a) S_N1 mechanism
b) S_N2 mechanism
c) Both S_N1 and S_N2 mechanism
d) None of the above

Answer: a

Question: Which of the following alkyl halides has maximum density?
a) C₃H₇I  
b) C₂H₅I  
c) CH₃Br 
d) CH₃I 

Answer: d

Question: Which of the following is not correct?
a) PhCH₂Br > PhCHBrCH₃ > PhCBr(CH₃)₂(SN₁)
b) R—I > R—Br > R—Cl (S_N2)
c) CH₂==CH—Cl < CH₂==CH—CH₂—Cl
                                               < PhCH₂—Cl (SN1)
d) R—Cl < R—Br < R—I (S_N1)

19. CH3—CH2—CH2—Br Alc. KOH.
                                       →
Final product is
a) propene
b) propanol
c) cyclopropane
d) propan-1, 2-diol

Answer: a

Question: Which of the following is correct order for the ease of dehydrohalogenation of alkyl halide with alc. KOH?
a) 3° < 2° < 1°
b) 3° > 2° < 1°
c) 3° > 2° > 1°
d) 3° < 2° > 1°

Answer: c

Question: Consider the following reaction,
2CHCl₃ + O₂ → A + B
The products A and B of above reaction respectively are
a) CO₂ and HCl 
b) COCl₂ and HCl 
c) CO and HCl
d) None of these

Answer: b

Question: Which of the following compound is used as an organic insecticide?
a) Chloroform
b) Freon-12
c) Carbon tetrachloride
d) DDT

Answer: d

Please click on below link to download CBSE Class 12 Chemistry Haloalkanes And Haloarenes Question Bank Set B