Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes MCQs
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Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes MCQs (SET A)
1) Which of the following solvent would promote SN2 reaction?
(a) H2O
(b) Hexane
(c) CH3CH2OH
(d) Acetone
Answer: Acetone.
2) In SN1 reaction, the first step involves the formation of
(a) Free radical
(b) Carbanion
(c) Carbocation
(d) Final product
Answer: Carbocation.
3) SN2 reaction on a chiral center proceeds via
(a) Complete Retention
(b) Complete Inversion
(c) Complete Racemization
(d) Partial Racemization
Answer: Complete Inversion.
4) Without exception, SN2 reaction at chiral carbon gives:
(a) Enantiomer of substrate
(b) Product of opposite polarity
(c) Diastereomeric mixture
(d) Only one stereoisomer
Answer: Only one stereoisomer.
5) The organic chloro compound, which shows complete stereochemical inversion during an SN2 reaction is:
(a) (C2H5)2CHCl
(b) (CH3)3CCl
(c) (CH3)2CHCl
(d) None
Answer: None.
6) n-Propyl bromide on treatment with ethanolic potassium hydroxide producer
(a) Propane
(b) Propene
(c) Propyne
(d) Propanol
Answer: Propene.
7) Elimination of bromine from 2-bromobutane results in the formation of A is:
(a) Predominantly 2-butyne
(b) Predominantly 1-butene
(c) Predominantly 2-butene
(d) Equimolar mixture of 1 and 2-butene
Answer: Predominantly 2-butene.
Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes MCQs (SET B)
1) Reagent not used to prepare an alkyl halide from an alcohol is:
(a) HCl + ZnCl2
(b) NaCl
(c) PCl5
(d) SOCl2
Answer: NaCl.
2) 1-Chlorobutane on reaction with alcoholic potash gives
(a) But-1-ene
(b) 1-Butanol
(3) But-2-ene
(4d) 2-Butanol
Answer: But-1-ene.
3) C2H5Cl on heating with alcoholic KOH will produce
(a) C2H5OH
(b) C2H4
(c) C2H2
(d) C2H6
Answer: C2H4.
4) Which of the following is primary halide?
(a) Isopropyl halide
(b) Secondary butyl halide
(c) Tertiary butyl halide
(d) Neo hexyl halide
Answer: Neo hexyl halide.
5) The compound which contains all the four 1°, 2°, 3° and 4° carbon atoms is:
(a) 2, 2-Dimethylpentane
(b) 2, 3, 3-Trimethylpentane
(c) 2, 3, 4-Trimethylpentane
(d) 3, 3-Dimethylpentane
Answer: 2, 3, 3-Trimethylpentane.
6) How many cyclic structural isomers are possible for C4H7I?
(a) 3
(b) 4
(c) 5
(d) 6
Answer: 4.
7) Formation of alkyl fluorides from alkyl chloride or bromides is called
(a) Hunsdiecker reaction
(b) Fitting reaction
(c) Swarts reaction
(d) Finkelstein reaction
Answer: Swarts reaction.
Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes MCQs (SET C)
1) Most suitable reagent for following conversion is R – OH→R – Cl
(a) Anhyd. ZnCl2 + HCl
(b) PCl5
(c) SOCl2
(d) NaCl
Answer: SOCl2.
2) 2-methyl butane on reacting with bromine in the presence of sunlight give mainly
(a) 1-Bromo-3-methylbutane
(b) 2- Bromo-3-methylbutane
(c) 2- Bromo-2-methylbutane
(d) 1-Bromo-2-methylbutane
Answer: 2- Bromo-2-methylbutane.
3) The compound which reacts fastest with Lucas reagent at room temperature is
(a) Butan-2-ol
(b) Butan-1-ol
(c) 2-Methyl propan-1-ol
(d) 2-Methyl propan-2-ol
Answer: 2-Methyl propan-2-ol.
4How many structures of F is possible?
(a) 2
(b) 5
(c) 6
(d) 3
Answer: 3.
5) Of the four isomeric hexanes, the isomer which can give two monochlorinated compounds, is
(a) 2-Methylpentane
(b) 2, 2-Dimethylbutane
(c) 2, 3-Dimethylbutane
(d) n-Hexane
Answer: 2, 3-Dimethylbutane.
6) CH3Br + OH̅ → CH3OH + Br−reaction proceeds by SN2 mechanism. Its rate is dependent on the concentration of
(a) CH3Br,OH̅
(b) CH3Br only
(c) OH̅ only
(d) CH3Br, CH3OH
Answer: CH3Br,OH̅.
7) How many possible monochloro structural isomers expected to be formed on free radical monochlorination of (CH3)2CHCH2 CH3
(a) 4
(b) 3
(c) 2
(d) 5
Answer: 4.
Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes MCQs (SET D)
1) Replacement of Cl of chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4–dinitrochlorobenzene is readily replaced because:
(a) NO2 makes the electron rich ring at ortho and para positions
(b) NO2 withdraws electrons at meta-position
(c) NO2 donate electrons at m-position
(d) NO2 withdraws electrons at ortho and para positions
Answer: NO2 withdraws electrons at ortho and para positions.
2) The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly
(a) m-Chlorotoluene
(b) Benzoyl chloride
(c) Benzyl chloride
(d) o and p-Chlorotoluene
Answer: o and p-Chlorotoluene.
3) The reaction of C6H5N2 +Cl– with CuCl gives
(a) C6H5Cl
(b) C6H6
(c) C6H5– C6H5
(d) C6H5C12
Answer: C6H5Cl.
4) The Reagent used in the gattermann reaction for the preparation of aryl halide
(a) CCl4
(b) HBF4
(c) Cu/HCl
(d) HNO2
Answer: Cu/HCl.
5) Chlorobenzene can be obtained from benzene diazonium chloride by
(a) Gattermann’s reaction
(b) Friedel Crafts reaction
(c) Wurtz reaction
(d) Fittig reaction
Answer: Gattermann’s reaction.
6) The IUPAC name of the compound, (CH3)2CHCH2CH2Br is:
(a) 2-methyl-3-bromopropane
(b) 1-bromopentane
(c) 2-methyl-4-bromobutane
(d) 1-bromo-3-methylbutane
Answer: 1-bromo-3-methylbutane.
7) Which one of the following compound reacts with chlorobenzene to produce DDT?
(a) Acetaldehyde
(b) Nitrobenzene
(c) 𝑚-chloroacetaldehyde
(d) Trichloroacetaldehyde
Answer: Trichloroacetaldehyde.
Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes MCQs (SET E)
1) Reaction of alkyl halides with aromatic compounds in presence of anhy.AlCl3 is known as
(a) Friedel-Craft’s reaction
(b) Hofmann degradation
(c) Kolbe’s synthesis
(d) Beckmann rearrangement
Answer: Friedel-Craft’s reaction.
2) Molecular formula of chloropicrin is
(a) CHCl3NO2
(c) CCl3NO3
(c) CCl2NO2
(d) CCl3NO2
Answer: CCl3NO2.
3) Ethyl alcohol gives ethyl chloride on treatment with:
(a) NaCl
(b) SOCl2
(c) Cl2
(d) KCl
Answer: SOCl2.
4) Elimination of HBr from 2-bromobutane results in the formation of:
(a) Equimolar mixture of 1- and 2- butene
(b) Predominantly 2-butene
(c) Predominantly 1- butene
(d) Predominantly 2-butyne
Answer: Predominantly 2-butene.
5) Which of the following is primary halide?
(a) Isopropyl halide
(b) Sec-butyl halide
(c) Tert-butyl halide
(d) Neo-hexyl chloride
Answer: Neo-hexyl chloride.
6) The order of polarity of CH3I, CH3Br and CH3Cl molecules follows the order:
(a) CH3Br > CH3Cl > CH3I
(b) CH3I > CH3Br > CH3Cl
(c) CH3Cl > CH3Br > CH3I
(d) CH3Cl > CH3I > CH3Br
Answer: CH3Cl > CH3Br > CH3I.
7) Optically active compound is:
(a) 2-chloropropane
(b) 2-chlorobutane
(c) 3-chloropentane
(d) None of these
Answer: 2-chlorobutane.
Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes MCQs (SET F)
1) Which one is most reactive towards SN1 reactions?
(a) C6H5CH(C6H5)Br
(b) C6 H5CH(CH3)Br
(c) C6H5C(CH3)(C6H5)Br
(d) C6H5CH2 Br
Answer: C6H5C(CH3)(C6H5)Br.
2) For a given alkyl group, the densities/b. p./m.p. are in the order:
(a) 𝑅I < 𝑅Br < 𝑅Cl
(b) 𝑅I < 𝑅Cl < 𝑅Br
(c) 𝑅Br < 𝑅I < 𝑅Cl
(d) 𝑅Cl < 𝑅Br < 𝑅I
Answer: 𝑅Cl < 𝑅Br < 𝑅I.
3) Among the following which one has weakest carbon-halogen bond?
(a) Benzyl bromide
(b) Bromobenzene
(c) Vinyl bromide
(d) Benzyl chloride
Answer: Benzyl bromide.
4) t-butyl chloride preferably undergo hydrolysis by
(a) SN1 mechanism
(b) SN2 mechanism
(c) Any of (a) and (b)
(d) None of the above
Answer: SN1 mechanism.
5) Pick up the correct statement about alkyl halides:
(a) They show H-bonding
(b) They are soluble in water
(c) They are soluble in organic solvents
(d) They do not contain any polar bond
Answer: They are soluble in organic solvents.
6) (CH3)3CMgCl on reaction with D2O gives:
(a) (CH3)3CD
(b) (CH3)3OD
(c) (CD3)3CD
(d) (CD3)3OD
Answer: (CH3)3CD.
7) Wurtz’s reaction involves the reduction of alkyl halide with
(a) Zn/HCl
(b) HI
(c) Zn/Cu couple
(d) Na in ether
Answer: Na in ether.
Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes MCQs (SET G)
1) Which is most reactive for SN2 reactions?
(a) CH3I
(b) C2H5I
(c) C3H7I
(d) C4H9
Answer: CH3I.
2) A Grignard reagent is prepared by reacting magnesium with:
(a) Methyl amine
(b) Diethyl ether
(c) Ethyl iodide
(d) Ethyl alcohol
Answer: Ethyl iodide.
3) Phosgene is a common name for:
(a) CO2 and PH3
(c) Phosphoryl chloride
(c) Carbonyl chloride
(d) Carbon tetrachloride
Answer: Carbonyl chloride.
4) Which of the following is least reactive in a nucleophilic substitution reaction?
(a) (CH3)3CCl
(b) CH2=CHCl
(c) CH3CH2Cl
(d) CH2=CHCH2Cl
Answer: CH2=CHCl.
5) SN1 reaction is favoured by:
(a) Non-polar solvents
(b) More no. of alkyl group on the carbon atom attached to the halogen atom
(c) Small groups on the carbon attached to the halogen atom
(d) None of the above
Answer: More no. of alkyl group on the carbon atom attached to the halogen atom.
6) In SN1 reaction, the first step involves the formation of:
(a) Free radical
(b) Carbanion
(c) Carbocation
(d) Final product
Answer: Carbocation.
7) 2-bromopentane is heated with potassium\ethoxide in ethanol. The major product is:
(a) 𝑡𝑟𝑎𝑛𝑠-pent-2-ene
(b) 2-ethoxy pentane
(c) pent-1-ene
(d) 𝑐𝑖𝑠-pent-2-ene
Answer: 𝑡𝑟𝑎𝑛𝑠-pent-2-ene.
Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes MCQs (SET H)
1) 𝑅𝑋 + 𝐴 → 𝑅𝑁𝐶: A is
(a) AgCN
(b) KCN
(c) NaCN
(d) HCN
Answer: AgCN.
2) Which is gem dihalide?
(a) CH3 ∙ CHBr2
(b) CH2Br ∙ CH2Br
(c) CH3 ∙ CHBr ∙ CH2Br
(d) None of these
Answer: CH3 ∙ CHBr2.
3) Decomposition of benzene diazonium chloride by using Cu2Cl2/HCl to form chlorobenzene is
(a) Raschig’s reaction
(b) Sandmeyer’s reaction
(c) Kolbe’s reaction
(d) Cannizaro’s reaction
Answer: Sandmeyer’s reaction.
4) Which is most reactive for SN2 reactions?
(a) CH3I
(b) C2H5I
(c) C3H7I
(d) C4H9
Answer: CH3I.
5) A Grignard reagent is prepared by reacting magnesium with:
(a) Methyl amine
(b) Diethyl ether
(c) Ethyl iodide
(d) Ethyl alcohol
Answer: Ethyl iodide.
6) Phosgene is a common name for:
(a) CO2 and PH3
(b) Phosphoryl chloride
(c) Carbonyl chloride
(d) Carbon tetrachloride
Answer: Carbonyl chloride.
7) Which of the following is least reactive in a nucleophilic substitution reaction?
(a) (CH3)3CCl
(b) CH2=CHCl
(c) CH3CH2Cl
(d) CH2=CHCH2Cl
Answer: CH2=CHCl.
Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes MCQs (SET I)
1) SN1 reaction is favoured by:
(a) Non-polar solvents
(b) More no. of alkyl group on the carbon atom attached to the halogen atom
(c) Polar solvents
(d) None of the above
Answer: More no. of alkyl group on the carbon atom attached to the halogen atom.
2) Reagent not used to prepare an alkyl halide from an alcohol is:
(a) HCl + ZnCl2
(b) NaCl
(c) PCl5
(d) SOCl2
Answer: NaCl.
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