Unit 10 » Haloalkanes and Haloarenes- MCQs (12th) | Chemistry | Objective Questions- 12th

Multiple Choice

ID- 14232

BSEB, 2020 (A)

1. The molecular formula of benzene is:

(A) C₆H₅
(B) C₆H₆
(C) C₆H₁₂
(D) None of these

Sep 23, 2022 at 05:52 AM

Multiple Choice

ID- 14233

BSEB, 2019 (C)

2. NaOH is:

(A) Acid
(B) Base
(C) Salt
(D) All

Sep 23, 2022 at 05:53 AM

Multiple Choice

ID- 14234

BSEB, 2016

3. Good conductor of electricity and heat is:

(A) Anthracite coke
(B) Diamond
(C) Graphite
(D) Charcoal

Sep 23, 2022 at 05:54 AM

Multiple Choice

ID- 14235

BSEB, 2016

4. In which of the following allotropes of carbon, percentage of carbon is maximum?

(A) Wood charcoal
(B) Coconut charcoal
(C) Graphite
(D) None of these

Sep 23, 2022 at 05:56 AM

Multiple Choice

ID- 14236

BSEB, 2016

5. The haybridisation of carbon in diamond is:

(A) sp³
(B) sp²
(C) sp
(D) dsp²

Sep 23, 2022 at 05:58 AM

Multiple Choice

ID- 14237

BSEB, 2016

6. Organic compound must contain an element:

(A) oxygen
(B) carbon
(C) hydrogen
(D) nitrogen

Sep 23, 2022 at 05:59 AM

Multiple Choice

ID- 14238

BSEB, 2016

7. Alkene gives which of the following reactions?

(A) Addition reaction
(B) Substitution reaction
(C) Both 'A' and 'B'
(D) None of these

Sep 23, 2022 at 06:01 AM

Multiple Choice

ID- 14239

BSEB, 2016

8. Single bond length between carbon-carbon is:

(A) 1.34 Å
(B) 1.20 Å
(C) 1.54 Å
(D) none of these

Sep 23, 2022 at 06:02 AM

Multiple Choice

ID- 14240

BSEB, 2016

9. Valenct of carbon is:

(A) 1
(B) 2
(C) 3
(D) 4

Sep 23, 2022 at 06:03 AM

Multiple Choice

ID- 14241

BSEB, 2016

10. Criteria for purity of organic solid is:

(A) boiling point
(B) melting point
(C) specific gravity
(D) none of these

Sep 23, 2022 at 06:05 AM

Multiple Choice

ID- 14242

BSEB, 2015

11. General formula of Alkene is:

(A) C_nH_2n
(B) C_nH_2n+2
(C) C_nH_2n-2
(D) None of these

Sep 23, 2022 at 06:07 AM

Multiple Choice

ID- 14243

BSEB, 2015

12. Hybridisation of carbon in ethane is:

(A) sp³
(B) sp²
(C) sp
(D) sp³d²

Sep 23, 2022 at 06:09 AM

Multiple Choice

ID- 14244

BSEB, 2015

13. Number of π bonds in ethyne is:

(A) one
(B) two
(C) three
(D) four

Sep 23, 2022 at 06:11 AM

Multiple Choice

ID- 14245

BSEB, 2012

14. The compound havind general formula C_nH_2n+2 is:

(A) Alkene
(B) Alkyne
(C) Alkane
(D) None of these

Sep 23, 2022 at 06:13 AM

Multiple Choice

ID- 14246

BSEB, 2010

15. The antiseptic action of CHI₃ is:

(A) due to idoform
(B) due to liberation of free iodine
(C) partially due to iodine and partially due to CHI₃
(D) None of these

Sep 23, 2022 at 06:16 AM

Multiple Choice

ID- 14247

16. Which of the following compounds can yield only one monochlorinated product upon free redical chlorination?

(A) 2,2-Dimethylpropane
(B) 2-Methylpropane
(C) 2-Methylbutane
(D) n-Butane

Sep 23, 2022 at 06:19 AM

Multiple Choice

ID- 14248

17. Bromination of methane in presence of sunlight is a:

(A) nucleophilic substitution
(B) free radical substitution
(C) electrophilic substitution
(D) nucleophilic addition

Sep 23, 2022 at 06:20 AM

Multiple Choice

ID- 14249

18. Which of the following reactions follows Markovnikov's rule?

(A) C₂H₄ + HBr
(B) C₃H₆ + Cl₂
(C) C₃H₆ + HBr
(D) C₃H₆ + Br₂

Sep 23, 2022 at 03:46 PM

Multiple Choice

ID- 14250

19. The reaction of toluene with chlorine in presence of FeCl₃ gives predominantly

(A) a mixture of o- and p-chlorotoluene
(B) benzyl chloride
(C) m-Chlorotoluene
(D) benzoyl chloride

Sep 23, 2022 at 07:36 PM

Multiple Choice

ID- 14320

20. Which of the following compounds has the highest boiling point?

(A) CH₃CH₂CH₂Cl
(B) CH₃CH₂CH₂CH₂Cl
(C) Ch₃CH (CH₃) CH₂Cl
(D) (CH₃)₃CCl

Sep 24, 2022 at 05:17 AM

Multiple Choice

ID- 14321

21. Which of the following molecules has highest dipole moment?

(A) CH₃Cl
(B) CH₂Cl₂
(C) CHCl₅
(D) CCI₄

Sep 24, 2022 at 05:19 AM

Multiple Choice

ID- 14322

BSEB, 2019 (A)

22. Number of (σ) sigma bonds in CH₄ is:

(A) 4
(B) 3
(C) 2
(D) 1

Sep 24, 2022 at 05:40 AM

Multiple Choice

ID- 14323

23. Alkyl halides are immiscible in water through they are polar because:

(A) they react with water to give alcohols
(B) they cannot form hydrogen bonds with water
(C) C—X bond cannot be broken easily
(D) they are stable compounds and are not reactive

Sep 24, 2022 at 05:43 AM

Multiple Choice

ID- 14324

24. Which one of the following is not correct order of boiling points of the alkyl/aryl haldies?

(A) CHCl₃ > CH₂Cl₂
(B) CH₃(CH₂)₃ Cl > CH₃ (CH₂)₂Cl
(C) (CH₃)₃ CCl > (CH₃)₂CHCH₂Cl
(D) CH₃(CH₂)₃Cl > CH₃CH₂CHClCH₃

Sep 24, 2022 at 05:58 AM

Multiple Choice

ID- 14359

25. Which of the following compounds will have highest melting point?

(A) Chlorobenzene
(B) o-Dichlorobenzene
(C) m-Dichlorobenzene
(D) p-Dichlorobenzene

Sep 24, 2022 at 06:08 PM

Multiple Choice

ID- 14360

26. Ethyl alcohol is obtained when ethyl chloride is boiled with

(A) alcoholic KOH
(B) aqueous KOH
(C) water
(D) aqueous KMnO₄

Sep 24, 2022 at 06:11 PM

Multiple Choice

ID- 14361

27. Butane nitrile can be prepared by heating

(A) propyl alcohol with KCN
(B) butyl chloride with KCN
(C) butyl alcohol with KCN
(D) propyl chloride with KCN

Sep 24, 2022 at 07:38 PM

Multiple Choice

ID- 14362

28. Methyl bromide reacts with AgF to give methyl fluoride and silver bromide. This reaction is called:

(A) Fitting reaction
(B) Swarts reaction
(C) Wurtz reaction
(D) Finkelstein reaction

Sep 24, 2022 at 07:00 PM

Multiple Choice

ID- 14363

29. The alkyl halide is convented into an alcohol by:

(A) elimination
(B) dehydrohalogenation
(C) addition
(D) substitution

Sep 24, 2022 at 07:03 PM

Multiple Choice

ID- 14364

30. A mixture of 1-chloropropane and 2-chloropropane when treated with alcoholic KOH gives:

(A) prop-1-ene
(B) prop-2-ene
(C) a mixture of prop-1-ene and prop-2-ene
(D) propanol

Sep 24, 2022 at 07:06 PM

Multiple Choice

ID- 14365

31. Grignard reagents are formed by the reaction of alkyl halides by warming:

(A) with alcoholic solution
(B) with $\ce{MgCl2}$
(C) Mg in presence of dry ether
(D) with $\ce{MgCO3}$

Sep 24, 2022 at 09:15 PM

Multiple Choice

ID- 14366

32. Arrange the following alkyl haldies in order of dehydrohalogenation; $$\ce{C2H5I, C2H5Cl, C2H5Br, C2H5F}$$

(A) $\ce{C2H5F > C2H2Cl > C2H5Br > C2H2I}$
(B) $\ce{C2H5I > C2H5Br > C2H5Cl > C2H5F}$
(C) $\ce{C2H5I > C2H5Cl > C2H5Br > C2H5F}$
(D) $\ce{C2H5F > C2H5I > C2H5Br > C2H5Cl}$

Sep 24, 2022 at 07:43 PM

Multiple Choice

ID- 14386

33. Which of the following is most reactive towards aqueous NaOH?

(A) $\ce{C6H6Cl}$
(B) $\ce{C6H5CH2Cl}$
(C) $\ce{C6H5Br}$
(D) $\ce{BrC6H4Br}$

Sep 25, 2022 at 05:40 AM

Multiple Choice

ID- 14387

34. 2-Bromo-3, 3-dimethylbutane on reaction with aqueous KOH yields X as the major product. X is:

(A) 2, 3, 3-trimethylpropan-1-ol
(B) 2, 2-dimethylbutan-3-ol
(C) 3, 3-dimenthylburan-2-ol
(D) 2, 2-dimethylpropan-2-ol

Sep 25, 2022 at 05:45 AM

Multiple Choice

ID- 14388

35. Ethylene dichloride and ethylidene chloride are isomeric compounds. The false statements about these isomers is that they:

(A) are both hydrolysed to the same product
(B) contain the same percentage of chlorine
(C) are position isomers
(D) react with alcoholic potash and give the same product

Sep 25, 2022 at 05:48 AM

Multiple Choice

ID- 14389

36. Which of the following haloalkanes reacts with aquous KOH most easily?

(A) 1-Bromobutane
(B) 2-Bromobutane
(C) 2-Bromo-2-methylpropane
(D) 2-Chlorobutane

Sep 25, 2022 at 05:51 AM

Multiple Choice

ID- 14390

BSEB, 2018 (C)

37. Which of the most stable carbocation?

(A) $\ce{(CH3)2\overset{⊕}{C}H}$
(B) $\ce{C6H5 – \overset{⊕}{C}H2}$
(C) $\ce{(CH3)3\overset{⊕}{C}}$
(D) $\ce{CH2 = CH\overset{⊕}{C}H2}$

Sep 25, 2022 at 06:03 AM

Multiple Choice

ID- 14391

BSEB, 2018 (C)

38. Which is the strongest nucleophile?

(A) $\ce{\overset{Θ}{C}H3}$
(B) $\ce{CH3 – \overset{Θ}{C}H2}$
(C) $\ce{\overset{Θ}{N}H2}$
(D) $\ce{CH3 – \overset{Θ}{O}}$

Sep 25, 2022 at 06:12 AM

Multiple Choice

ID- 14392

39. Toluene reacts with a halogen in the presence of iron (III) chloride giving ortho and para halo compounds. This reaction is:

(A) electrophilic elimination reaction
(B) electrophilic substitution reaction
(C) free radical addition reaction
(D) nucleophilic substitution reaction

Sep 25, 2022 at 06:17 AM

Multiple Choice

ID- 14393

40. Which reagent will you use for the following reaction?$\ce{CH2CH2CH2CH3→}$$\ce{CH3CH2CH2CH2Cl + }$$\ce{CH3CH2CHClCH3}$

(A) $\ce{Cl2/UV}$ light
(B) NaCl + $\ce{H2SO4}$
(C) $\ce{Cl2}$ gas in dark
(D) $\ce{Cl2}$ gas in the presence of iron in dark

Sep 25, 2022 at 06:23 AM

Multiple Choice

ID- 14394

41. Which of the following is an example of vic-dihalide?

(A) Dichloeomethane
(B) 1, 2-Dichloroethane
(C) Ethylidene chloride
(D) Allyl chloride

Sep 25, 2022 at 06:28 AM

Multiple Choice

ID- 14395

BSEB, 2021 (A)

42. $\ce{S_N2}$ mechanism proceeds via formation of:

(A) Carbocation
(B) Transition state
(C) Free radical
(D) Carbonion

Sep 25, 2022 at 11:50 AM

Multiple Choice

ID- 14566

BSEB, 2021 (A)

43. The product of the reaction $\ce{C2H5Br ->[KOH][Alcoholic]}$ is:

(A) $\ce{CH2 = CH2}$
(B) $\ce{CH3CH2OH}$
(C) $\ce{CH3CH2OCH2CH3}$
(D) none of these

Sep 29, 2022 at 07:39 AM

Multiple Choice

ID- 14567

44. Ethylidene chloride is a/an ..........

(A) vic-dihalide
(B) gem-dihalide
(C) allylic halide
(D) vinylic halide

Sep 29, 2022 at 07:41 AM

Multiple Choice

ID- 14568

45. A primary alkyl halide would prefer to under go ..........

(A) $\ce{S_N1}$ reaction
(B) $\ce{S_N2}$ reaction
(C) α-elimination
(D) racemisation

Sep 29, 2022 at 07:50 AM

Multiple Choice

ID- 14569

46. Which of the following alkyl haldies will undergo $\ce{S_N1}$ reaction most readily?

(A) $\ce{(CH3)3}$ C—F
(B) $\ce{(CH3)3}$C—Cl
(C) $\ce{(CH3)3}$C—Br
(D) $\ce{(CH3)3}$C—I

Sep 29, 2022 at 09:30 AM

Multiple Choice

ID- 14570

47. What should be correct IUPAC name for diethyl-bromomethane?

(A) 1-Bromo-1, 1-diethylmethane
(B) 3-Bromopentane
(C) 1-Bromo-1-ethylpropane
(D) 1-Bromopentane

Sep 29, 2022 at 09:47 AM

Multiple Choice

ID- 14591

48. Molecules whose mirror image os non-superimposable over them are known as chiral. Which of the following molecules is chiral in nature?

(A) 2-Bromobutane
(B) 1-Bromobutane
(C) 2-Bromopropane
(D) 2-Bromopropan-2-ol

Sep 29, 2022 at 01:20 PM

Multiple Choice

ID- 14592

BSEB, 2021 (A)

49. The reaction between alkyl halide and sodium metal is called:

(A) Wurtz reaction
(B) Kolbe's reaction
(C) Clemmensen's reaction
(D) None of these

Sep 29, 2022 at 01:22 PM

Multiple Choice

ID- 14593

50. Reaction of $\ce{C6H5CH2Br}$ with aqueous sodium hydroxide follows ..........

(A) $\ce{S_N1}$ mechanism
(B) $\ce{S_N2}$ mechanism
(C) Any of the above two depending upon the tempera-ture of reaction
(D) Saytzeff rule

Sep 29, 2022 at 06:38 PM

Multiple Choice

ID- 14594

BSEB, 2021 (A)

51. Which one of the following is the main product of the reaction $\ce{ ->[Light]}$ .......... + HCl?

(A) $\ce{CO2}$
(B) $\ce{Cl2}$
(C) $\ce{COCl2}$
(D) None of these

Sep 29, 2022 at 06:50 PM

Multiple Choice

ID- 14595

BSEB, 2017 (A)

52. A Grignard reagent is prepared by the action of magnetic-sium in dry ether on?

(A) $\ce{C2H5OH}$
(B) $\ce{C2H6}$
(C) $\ce{C2H5Cl}$
(D) $\ce{C2H5CN}$

Sep 29, 2022 at 06:54 PM

Multiple Choice

ID- 14596

BSEB, 2017 (A)

53. Ethyl acetate reacts with $\ce{Ch3MgBr}$ from:

(A) Secondry alcohol
(B) Tertiary Alcohol
(C) Primary Alcohol and Acid
(D) Carboxylic Acid

Sep 29, 2022 at 06:56 PM

Multiple Choice

ID- 14597

BSEB, 2017 (C)

54. In a given reaction: $\ce{CH3—CH2—CH}$ = $\ce{CH2 + HI -> X}$ the product is:

(A) 1-Iodobutane
(B) 2-Iodobutane
(C) 2-Butene
(D) 1, 2-di-iodobutane

Sep 29, 2022 at 07:00 PM

Haloalkanes and Haloarenes

Board » Bihar Board » Class 12th » English Medium » Science » Chemistry » Part-2 » Unit 10: Haloalkanes and Haloarenes

Objective Questions (MCQs)

1. The molecular formula of benzene is:

2. NaOH is:

3. Good conductor of electricity and heat is:

4. In which of the following allotropes of carbon, percentage of carbon is maximum?

5. The haybridisation of carbon in diamond is:

6. Organic compound must contain an element:

7. Alkene gives which of the following reactions?

8. Single bond length between carbon-carbon is:

9. Valenct of carbon is:

10. Criteria for purity of organic solid is:

11. General formula of Alkene is:

12. Hybridisation of carbon in ethane is:

13. Number of π bonds in ethyne is:

14. The compound havind general formula CnH2n+2 is:

15. The antiseptic action of CHI3 is:

16. Which of the following compounds can yield only one monochlorinated product upon free redical chlorination?

17. Bromination of methane in presence of sunlight is a:

18. Which of the following reactions follows Markovnikov's rule?

19. The reaction of toluene with chlorine in presence of FeCl3 gives predominantly

20. Which of the following compounds has the highest boiling point?

21. Which of the following molecules has highest dipole moment?

22. Number of (σ) sigma bonds in CH4 is:

23. Alkyl halides are immiscible in water through they are polar because:

24. Which one of the following is not correct order of boiling points of the alkyl/aryl haldies?

25. Which of the following compounds will have highest melting point?

26. Ethyl alcohol is obtained when ethyl chloride is boiled with

27. Butane nitrile can be prepared by heating

28. Methyl bromide reacts with AgF to give methyl fluoride and silver bromide. This reaction is called:

29. The alkyl halide is convented into an alcohol by:

30. A mixture of 1-chloropropane and 2-chloropropane when treated with alcoholic KOH gives:

31. Grignard reagents are formed by the reaction of alkyl halides by warming:

32. Arrange the following alkyl haldies in order of dehydrohalogenation; $$\ce{C2H5I, C2H5Cl, C2H5Br, C2H5F}$$

33. Which of the following is most reactive towards aqueous NaOH?

34. 2-Bromo-3, 3-dimethylbutane on reaction with aqueous KOH yields X as the major product. X is:

35. Ethylene dichloride and ethylidene chloride are isomeric compounds. The false statements about these isomers is that they:

36. Which of the following haloalkanes reacts with aquous KOH most easily?

37. Which of the most stable carbocation?

38. Which is the strongest nucleophile?

39. Toluene reacts with a halogen in the presence of iron (III) chloride giving ortho and para halo compounds. This reaction is:

40. Which reagent will you use for the following reaction?$\ce{CH2CH2CH2CH3→}$$\ce{CH3CH2CH2CH2Cl + }$$\ce{CH3CH2CHClCH3}$

41. Which of the following is an example of vic-dihalide?

42. $\ce{S_N2}$ mechanism proceeds via formation of:

43. The product of the reaction $\ce{C2H5Br ->[KOH][Alcoholic]}$ is:

44. Ethylidene chloride is a/an ..........

45. A primary alkyl halide would prefer to under go ..........

46. Which of the following alkyl haldies will undergo $\ce{S_N1}$ reaction most readily?

47. What should be correct IUPAC name for diethyl-bromomethane?

48. Molecules whose mirror image os non-superimposable over them are known as chiral. Which of the following molecules is chiral in nature?

49. The reaction between alkyl halide and sodium metal is called:

50. Reaction of $\ce{C6H5CH2Br}$ with aqueous sodium hydroxide follows ..........

51. Which one of the following is the main product of the reaction $\ce{ ->[Light]}$ .......... + HCl?

52. A Grignard reagent is prepared by the action of magnetic-sium in dry ether on?

53. Ethyl acetate reacts with $\ce{Ch3MgBr}$ from:

54. In a given reaction: $\ce{CH3—CH2—CH}$ = $\ce{CH2 + HI -> X}$ the product is:

14. The compound havind general formula C_nH_2n+2 is:

15. The antiseptic action of CHI₃ is:

19. The reaction of toluene with chlorine in presence of FeCl₃ gives predominantly

22. Number of (σ) sigma bonds in CH₄ is: