MCQ Questions Chapter 10 Haloalkanes and Haloarenes Class 12 Chemistry

Please refer to MCQ Questions Chapter 10 Haloalkanes and Haloarenes Class 12 Chemistry with answers provided below. These multiple-choice questions have been developed based on the latest NCERT book for class 12 Chemistry issued for the current academic year. We have provided MCQ Questions for Class 12 Chemistry for all chapters on our website. Students should learn the objective based questions for Chapter 10 Haloalkanes and Haloarenes in Class 12 Chemistry provided below to get more marks in exams.

Chapter 10 Haloalkanes and Haloarenes MCQ Questions

Please refer to the following Chapter 10 Haloalkanes and Haloarenes MCQ Questions Class 12 Chemistry with solutions for all important topics in the chapter.

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

Question. Which of the following alkyl halide is used as a methylating agent ?
(a) C₂H₅Br
(b) C₆H₅Cl 
(c) CH₃Cl 
(d) C₂H₅Cl     

Question. The addition of HI in the presence of peroxide catalyst does not follow anti-Markownikoff addition because
(a) HI is a strong reducing agent
(b) HI bond is too strong to be broken homolytically
(c) I atom combines with H-atom to give back HI
(d) Iodine atom is not reactive enough to add across a double bond   

Question. Given,

Question. The synthesis of alkyl fluorides is best accomplished by 
(a) free radical fluorination
(b) Sandmeyer’s reaction
(c) Finkelstein reaction
(d) Swarts reaction   

Question. Which of the following has highest melting point?
(a) Chlorobenzene
(b) o-dichlorobenzene
(c) m-dichlorobenzene
(d) p-dichlorobenzene     

Question.  Arrange the following compounds in the increasing order of their densities

(a) (i) < (ii) < (iii) < (iv)
(b) (i) < (iii) < (iv) < (ii)
(c) (iv) < (iii) < (ii) < (i)
(d) (ii) < (iv) < (iii) < (i)

Question. Consider the following bromides,

The correct order of SN1reactivity is
(a) B > C > A
(b) B > A > C
(c) C > B > A
(d) A > B > C

Question. Which branched chain isomer of the hydrocarbon with molecular mass 72 u gives only one isomer of mono substituted alkyl halide? 
(a) Tertiary butyl chloride
(b) Neo -pentane
(c) Iso -hexane
(d) Neo -hexane   

Question. The increasing order of reactivity of the following bromides in SN1 reaction is

(a) III > I > II > IV
(b) III > II > I > IV
(c) II > III > I > IV
(d) II > I > IV > III

Question. The organic chloro compound which shows complete stereochemical inversion during a SN₂ reaction, is
(a) CH₃Cl 
(b) (C₂H₅)₂CHCl
(c) (CH₃)₃CCl 
(d) (CH₃)₂CHCl     

Question. Preparation of alkyl halides in laboratory is least preferred by
(a) halide exchange
(b) treatment of alcohols
(c) addition of hydrogen halides to alkenes
(d) direct halogenation of alkanes   

Question. Match the following and choose the correct option.

Codes
A B C D
(a) 3 1 2 4
(b) 1 3 2 4
(c) 3 2 1 4
(d) 2 4 3 1

Question. C—Cl bond is stronger than C—I bond because
(a) C—Cl bond is more ionic than C—I
(b) C—Cl bond is polar covalent bond
(c) C—Cl bond is more covalent than C—Cl
(d) C—Cl bond length is longer than C—I     

Question. Which of the following compounds will give racemic mixture on nucleophilic substitution by OH− ion?

(a) I
(b) I, II, III
(c) II, III
(d) I, III

Question. The increasing order of reactivity of the following halides for the SN₁ reaction is
I. CH₃CH(Cl)CH₂CH₃
II. CH₃CH₂CH₂Cl
III. p −H₃CO— C₆H₄ —CH₂Cl
(a) (III)<(II)<(I)
(b) (II)< (I)<(III)
(c) (I)<(III)<(II)
(d) (II)<(III)<(I)     

Question. Aryl halides are less reactive than alkyl halides towards nucleophile due to
(a) resonance
(b) stability of carbonium ion
(c) high boiling point
(d) None of these         

Question. The major product of the following reaction is

Question. Chlorobenzene can be prepared by reacting aniline with:
(a) hydrochloric acid
(b) cuprous chloride
(c) chlorine in the presence of anhydrous aluminium chloride
(d) nitrous acid followed by heating with cuprous chloride     

Question. Which of the following that cannot undergo dehydrohalogenation is
(a) iso-propyl bromide
(b) ethanol
(c) ethyl bromide
(d) None of the above       

Question. The final product obtained in the reaction, is 

Question. What will be the end product (B) in the following sequence of reactions?

(a) 1, 2-dibromobenzene
(b) 1, 2-dibromobenzaldehyde
(c) 1, 3-dibromobenzene
(d) 1, 4-dibromobenzene       

Question. Benzyl chloride (C₆H₅CH₂Cl) can be prepared from toluene by chlorination with 
(a) Cl₂
(b) SO₂Cl₂
(c) SOCl₂
(d) NaOCl     

Question. Compound (A), C₈H₉Br gives a white precipitate when warmed with alcoholic AgNO₃ . Oxidation of (A) gives an acid (B), C₈H₆O₄ . (B) easily forms anyhydride on heating. Identify the compound (A) . 

Question. An equimolar mixture of toluene and chlorobenzene is treated with a mixture of cone. H₂SO₄ and cone. HNO₃ . Indicate the correct statement from the following.
(a) p -nitrotoluene is formed in excess 
(b) equimolar amounts of p-nitrotoluene and p -nitrochlorobenzene are formed
(c) p-nitrochlorobenzene is formed in excess
(d) m -nitrochlorobenzene is formed in excess     

Questionv. Four compounds, toluene (I), o -dichlorobenzene (II), m -dichlorobenzene (III) and p – dichlorobenzene (IV) are arranged in order of increasing dipole moment. The correct order is 
(a) IV < I < III < II
(b) I < TI < III < IV
(c) II < IV < III < I
(d) IV < III < II < I       

Question. In the chemical reactions, the compounds ‘A’ and ‘B’ respectively are 

(a) nitrobenzene and tluorobenzene
(b) phenol and benzene
(c) benzene diazonium chloride and tluorobenzene
(d) nitrobenzene and chlorobenzene     

Question. In the preparation of chlorobenzene from aniline, the most suitable reagent is
(a) chlorine in the presence of ultraviolet light
(b) chlorine in the presence of AICl₃
(c) nitrous acid followed by heating with Cu₂Cl₂
(d) HCI and Cu₂Cl₂     

Question. The major product of the following reaction is

Question. CH₃Br + Nu⁻ → CH₃ — Nu + Br⁻
The decreasing order of the rate of the above reaction with nucleophile (Nu⁻ )A to D is
[Nu⁻ = (A) PhO⁻, (B) AcO⁻, (C) HO⁻, (D)CH₃O⁻]
(a) D > C > A > B
(b) D > C > B > A
(c) A > B > C > D
(d) B > D > C > A       

Question. How many structures of F are possible?

(a) 2
(b) 5
(c) 6
(d) 3

Question. In nucleophilic substitution reaction, order of halogens as incoming (attacking) nucleophile is I⁻ > Br⁻ > Cl⁻. The order of halogens as departing nucleophile should be
(a) Br⁻ > I⁻ > Cl⁻
(b) I⁻ > Br⁻ > Cl⁻
(c) Cl⁻ > Br⁻  > I⁻
(d) Cl⁻ > I⁻ > Br⁻       

Question. Predict the main product in the given reaction :

(a) Phenyl cyanide
(b) Nitrophenol
(c) Aniline
(d) Hydroxylamine

Question. In alkaline hydrolysis of a tertiary halide by aqueous alkali, if concentration of alkali is doubled, then the reaction rate
(a) will be doubled
(b) will be halved
(c) will remain constant
(d) cannot say anything     

Question. Toluene reacts with excess ofCl2 in the presence of sunlight to give a product which on hydrolysis followed by reaction with NaOH gives

Question. Which halide will be least reactive in respect to hydrolysis ?
(a) Vinyl chloride
(b) Allyl chloride
(c) Ethyl chloride
(d) t-butyl chloride       

Question. In S₂Nreactions, the correct order of reactivity for the following compounds CH₃Cl, CH₃CH₂Cl, (CH₃ )₂CHCl and (CH₃ )₃CCl is 
(a) CH₃Cl > (CH₃)₂CHCl > CH₃CH₂Cl > (CH₃)₃CCl 
(b) CH₃Cl > CH₃CH₂Cl > (CH₃)₂CH₂Cl > (CH₃)₃CCl 
(c) CH₃CH₂Cl > CH₃Cl > (CH₃)₂CHCl > (CH₃) ₃CCl 
(d) (CH₃)₂CHCl  > CH₃CH₂Cl > CH₃Cl > (CH₃)₃CCl

Question.  Compound A, C8H9Br gives a white precipitate when warmed with alcoholic AgNO3. Oxidation of A gives an acid B, C8H6O4. B easily forms anhydride on heating. Identify the compound A.

Question. Choose the incorrect statement.
(a) An S_N1  reaction proceeds with inversion of configuration
(b) An S_N2 reaction proceeds with stereochemical inversion
(c) An S_N2  reaction follows second order kinetics
(d) The reaction of tert-butyl bromide with OH⁻ follows first order kinetics   

Question. A dihaloalkane X, having formula C₃H₆Cl₂, on hydrolysis gives a compound, that can reduce Tollen’s reagent.The compound ‘X’ is
(a) 1, 2- dichloropropane
(b) 1, 1- dichloropropane
(c) 1, 3- dichloropropane
(d) 2, 2- dichloropropane     

Question. Which of the following sequence of reagent is best suited for the reaction shown below?

(a) (i) CH3MgBr, H3O; (ii) H+ / D; (iii) HBr/ H O 2 2
(b) (i) CH3MgBr, H3O ; (ii) H+ / D; (iii) HBr
(c) (i) CH3MgBr, H3O ; (ii) HBr;
(d) (i) HBr/R OOR ; (ii) CH3MgBr, H3O+

Question. Choose the incorrect statement.
(a) An S_N1  reaction proceeds with inversion of configuration
(b) An S_N2 reaction proceeds with stereochemical inversion
(c) An S_N2  reaction follows second order kinetics
(d) The reaction of tert-butyl bromide with OH⁻ follows first order kinetics 

Question. A solution of (−) -1-chloro -1-phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of 
(a) carbene
(b) carbocation
(c) free radical
(d) carbanion     

Question. Which among the following reaction seems to be incorrect?

Question. The chlorine atom in chlorobenzene is ortho and para directing because
(a) resonance effect predominates over inductive effect
(b) inductive effect predominates over resonance effect
(c) both inductive and resonance effects are evenly matched
(d) only resonance effect and not inductive effect is operating         

Question. CCl₄ is a well known fire extinguisher. However, after using it to extinguish fire, the room should be well ventilated. This is because
(a) it is flammable at higher temperature
(b) it is toxic
(c) it produces phosgene by reaction with water vapour at higher temperature
(d) It is corrosive       

Question. 

Question. The reaction of toluene withCl₂ in the presence of FeCl₃ gives predominantly
(a) benzoyl chloride
(b) benzyl chloride
(c) o – and p-chlorotoluene
(d) m-chlorotoluene       

Question. The Wurtz-Fittig reaction involves condensation of
(a) two molecules of aryl halides
(b) one molecule of each of aryl halide and alkyl-halide
(c) one molecule of each aryl halide and phenol
(d) two molecules of a alkyl halides       

Question. Product on monobromination of this compound is

Question. Iodine from iodoethane can be substituted by cyanide group in a number of ways. Which of the following is true statement?
(a) With AgCN, EtNC while with KCN, EtCN is formed as major product
(b) With AgCN, EtCN and with KCN, EtNC is formed
(c) With either KCN or AgCN, EtNC is formed as major product
(d) With either KCN or AgCN, EtCN is formed as major product   

Question. A hydrocarbon has molecular mass = 72. It gives a single monochloride and two dichlorides on further photochlorination. The two dichlorides are
(a) CH₃CCl₂(CH₂)₂ CH₃ ; CH₃(CHCl)₂CH₂CH₃
(b) (CH₂)₂CCl₂CH₂CH₃ ; (CH₃)₂(CHCl)₂CH₃
(c) CHCl₂C(CH₃)₃ ; (CH₃)₂C(CH₂Cl)₂
(d) CHCl₂CH₂CH(CH₃)₂ CH₃CHClCH₂CHClCH₃     

Question. The major product of the following reaction is

Question. The reaction of toluene with Cl₂ in the presence of FeCl₃ gives X and reaction in presence of light gives Y. Thus, X and Y are
(a) X = benzyl chloride, Y = m- chlorotoluene
(b) X = benzyl chloride, Y = q – chlorotoluene
(c) X = m -chlorotoluene, Y = p- chlorotoluene
(d) X = o and p- chlorotoluene, Y = trichloromethyl benzene     

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. Bottles containing C₆H₅I and C₆H₅CH₂I lost their original lables. They were labelled A and B for testing. A and B were separately taken in test tubes and boiled with NaOH solution. The end solution in each tube was made acidic with dilute HNO₃ and then some AgNO₃ solution was added. Substance B gave a yellow precipitate. Which one of the following statements is true for this experiment?
(a) A was C₆H₅CH₂I
(b) A was C₆H₅CH₂I
(c) B was C₆H₅CH₂I
(d) Addition of HNO₃ was unnecessary         

Question. An organic compound C₅H₉Br (A) which readily decolourises bromine water and cold alkaline KMnO₄ solution and gives C₅H₁₁Br (B) on catalytic hydrogenation. The reaction of A with alcoholic KOH first and then with NaNH₂ produces C with evolution of NH₃. C reacts with Lindlar’s catalyst to give D and on reaction with Na in liquid NH₃ produces E. D and E are isomeric. The compound A is
                       Br
                       |
(a) CH₃CH₂CH == C — CH₃
                      Br
                      | 
(b) CH₃CH₂ — C == CHCH₃
(c) Both (a) and (b)
(d) Neither (a) nor (b)      

Question. Which is not the correct statement?
(a) Chloretone is an insecticide
(b) COCl₂ is called phosgene
(c) Chloropicrin is used as an insecticide
(d) CCl₄ is used as fire extinguisher under the name pyrene           

Question. (X ) on treatment with sodium hydroxide followed by the addition of silver nitrate give white precipitate at room temperature which is soluble in NH₄OH. (X) can be
(a) chlorobenzene
(b) ethyl bromide
(c) benzyl chloride
(d) vinyl chloride       

Question. One mole of hydrocarbon (A) reacts with 1 mole of bromine giving a dibromo compound C₅H₁₀Br₂. (A) on treatment with cold dilute alkaline KMnO4 solution forms a compound C₅H₁₂O₂. On ozonolysis, (A) gives equimolar quantities of propanone and ethanal. The compound (A) is
(a) (CH₃)₂C == CHCH₃
(b) (CH₃)₂CH —CH₂CH₃
(c) CH₃CH₂CH == CHCH₃
(d) CH₃ —CH— CH == CH₂       
                        |
                        CH₃ 

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