Home/Chemistry Mcqs/Chemistry Alkyl Halides Online Mcqs Test

Chemistry Alkyl Halides Online Mcqs Test

Mustansar KhanLast Updated: October 14, 2025

Important Chemistry Alkyl Halides Question and Answer

Total Questions:	84
Time Allowed:	40 Minutes
Total Marks:	84
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Chemistry Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Chemistry Interview Question Answer

Chemistry Alkyl Halides Practice Test Online With Explanation

Please wait...

Page 1 of 4

Uncategorized

1. Which of the following will undergo racemization in SN1 reaction?

2-chloro-2-methylpropane

2-bromobutane

1-bromobutane

Methyl chloride

2. In an SN2 reaction, what happens to the stereochemistry of the carbon center?

Rearranged

Racemized

Retained

Inverted

3. Which of the following best describes the SN1 reaction mechanism?

Radical chain reaction

Two-step with carbocation intermediate

Concerted elimination

One-step with inversion

4. Which type of solvent is preferred in SN1 reactions?

Non-polar

Polar protic

Polar aprotic

Acidic

5. What is the leaving group in an alkyl halide reaction?

Alkyl group

Carbon

Nucleophile

Halogen atom

6. Why is fluoride a poor leaving group?

It is unstable

It is too reactive

It forms strong C–F bonds

It is neutral

7. Which product is formed when 2-bromopentane reacts with NaOH under heat?

2-pentene

Pentanoic acid

2-pentanol

Pentane

8. The stability of carbocations follows the order:

Primary > Secondary > Tertiary

Secondary > Tertiary > Primary

Tertiary > Secondary > Primary

Methyl > Tertiary > Secondary

9. Which reaction involves the complete removal of a halide ion and formation of an alkene?

SN2

Addition

SN1

10. Which reaction involves the complete removal of a halide ion and formation of an alkene?

Addition

SN2

SN1

11. In SN1 reactions, the rate of reaction depends on:

Concentration of nucleophile only

Concentration of alkyl halide only

Both nucleophile and alkyl halide

Temperature only

12. Which of the following best describes the SN1 reaction mechanism?

Two-step with carbocation intermediate

Radical chain reaction

Concerted elimination

One-step with inversion

13. Which of the following halides will undergo SN1 reaction the fastest?

Tert-butyl bromide

Isopropyl iodide

Ethyl bromide

Methyl chloride

14. In an E2 reaction, the base removes:

The halogen

A hydrogen on the same carbon

A β-hydrogen

A methyl group

15. In SN2 reactions, the nucleophile attacks the substrate from the:

Back side

Front side

Above

Below

16. Which alkyl halide is least reactive in SN2 reactions?

Methyl iodide

Isopropyl chloride

Ethyl bromide

Tert-butyl bromide

17. Which mechanism is favored by tertiary halides in basic alcoholic medium?

SN1

SN2

18. Which factor increases the rate of SN1 reactions?

Strong nucleophile

Polar protic solvent

Weak base

Polar aprotic solvent

19. Which of the following solvents favors SN2 reactions?

Acetic acid

Ethanol

Water

Acetone

20. Which reaction mechanism involves two molecules in the rate-determining step?

SN1

SN2

E1cB

21. What is the leaving group in an alkyl halide reaction?

Carbon

Halogen atom

Nucleophile

Alkyl group

22. Which base is typically used in E2 reactions?

CH₃OH

NaOH

H₂O

NH₃

23. What is the general formula for alkyl halides?

CnH2n+1X

CnH2n+2

CnH2nBr

CnHXn

24. Which type of substitution occurs with inversion of configuration?

SN2

SN1

25. Which condition favors elimination over substitution?

Cold temperature

Strong base and heat

Weak base

Nonpolar solvent

Page 2 of 4

26. Which of the following reactions occurs in a single concerted step?

SN1

Acid hydrolysis

SN2

27. Which halogen is the most reactive in alkyl halides?

Iodine

Chlorine

Fluorine

Bromine

28. Which of the following is the correct IUPAC name for CH₃CH₂CH₂Cl?

2-chloropropane

Isopropyl chloride

Propyl chloride

1-chloropropane

29. Which of the following halides will undergo SN1 reaction the fastest?

Tert-butyl bromide

Methyl chloride

Isopropyl iodide

Ethyl bromide

30. Which of the following is the correct IUPAC name for (CH₃)₃CBr?

Tert-butyl bromide

1-bromobutane

2-bromobutane

2-bromo-2-methylpropane

31. In an SN2 reaction, what happens to the stereochemistry of the carbon center?

Inverted

Racemized

Rearranged

Retained

32. Which condition favors SN2 over SN1?

Weak nucleophile

Strong nucleophile and primary alkyl halide

Polar protic solvent

Tertiary alkyl halide

33. Which alkyl halide is least reactive in SN2 reactions?

Ethyl bromide

Tert-butyl bromide

Isopropyl chloride

Methyl iodide

34. Which of the following is a good leaving group?

–Br

–NH₂

–OH

–CH₃

35. Which of the following halides is most likely to undergo an E2 reaction?

Methyl chloride

Tertiary bromide

Secondary fluoride

Primary chloride

36. Which of the following halides is most likely to undergo an E2 reaction?

Methyl chloride

Secondary fluoride

Tertiary bromide

Primary chloride

37. Which of the following is not possible in SN2 reactions?

Backside attack

One-step reaction

Rearrangement

Inversion

38. Which of the following describes Zaitsev's Rule?

The halide leaves first

The least substituted product is formed

The more substituted alkene is the major product

The most stable carbocation forms first

39. Which alkyl halide undergoes SN2 reaction most readily?

Isopropyl chloride

Ethyl chloride

Methyl chloride

Tert-butyl chloride

40. The stability of carbocations follows the order:

Secondary > Tertiary > Primary

Primary > Secondary > Tertiary

Tertiary > Secondary > Primary

Methyl > Tertiary > Secondary

41. Which reaction mechanism involves two molecules in the rate-determining step?

SN2

E1cB

SN1

42. Which of the following favors E2 over E1?

Weak base

Low temperature

Strong base and heat

Polar protic solvent

43. Which condition favors elimination over substitution?

Nonpolar solvent

Cold temperature

Strong base and heat

Weak base

44. Which of the following will undergo racemization in SN1 reaction?

1-bromobutane

2-bromobutane

Methyl chloride

2-chloro-2-methylpropane

45. Which product is formed when 2-bromopentane reacts with NaOH under heat?

Pentanoic acid

Pentane

2-pentene

2-pentanol

46. Which of the following is the correct IUPAC name for CH₃CH₂CH₂Cl?

Isopropyl chloride

1-chloropropane

Propyl chloride

2-chloropropane

47. Which of the following is a secondary alkyl halide?

CH₃CHClCH₃

CH₃CH₂Cl

(CH₃)₃CCl

CH₃Cl

48. What is the molecular geometry of carbon in alkyl halides?

Tetrahedral

Trigonal planar

Trigonal bipyramidal

Linear

49. Which of the following is not possible in SN2 reactions?

Rearrangement

One-step reaction

Backside attack

Inversion

50. Which type of alkyl halide is most reactive in SN1 reactions?

Methyl

Primary

Tertiary

Secondary

Page 3 of 4

51. Why is fluoride a poor leaving group?

It is unstable

It is neutral

It forms strong C–F bonds

It is too reactive

52. Which product is expected when 2-chlorobutane undergoes SN2 with NaOH?

1-butanol

2-butanol

Butanoic acid

Butene

53. Which mechanism is favored by tertiary halides in basic alcoholic medium?

SN2

SN1

54. Which statement is true about E1 reactions?

Carbocation intermediate is formed

Occurs with strong bases only

Needs non-polar solvent

One-step process

55. What is the hybridization of the carbon atom bonded to the halogen in alkyl halides?

sp²d

sp³

sp²

56. In an E2 reaction, the base removes:

A β-hydrogen

A hydrogen on the same carbon

The halogen

A methyl group

57. What is the molecular geometry of carbon in alkyl halides?

Trigonal bipyramidal

Trigonal planar

Linear

Tetrahedral

58. Which type of solvent is preferred in SN1 reactions?

Non-polar

Acidic

Polar protic

Polar aprotic

59. Which halogen is the most reactive in alkyl halides?

Chlorine

Bromine

Fluorine

Iodine

60. Which of the following is a secondary alkyl halide?

(CH₃)₃CCl

CH₃Cl

CH₃CHClCH₃

CH₃CH₂Cl

61. Which of the following is a good leaving group?

–CH₃

–NH₂

–OH

–Br

62. Which product is formed in an E1 reaction from 2-butanol in acidic conditions?

Butane

Butene

Butanoic acid

Butanol

63. Which factor increases the rate of SN1 reactions?

Polar protic solvent

Strong nucleophile

Weak base

Polar aprotic solvent

64. Which type of substitution occurs with inversion of configuration?

SN2

SN1

65. Which is a characteristic of SN2 mechanism?

Rearrangement possible

Inversion of configuration

Carbocation intermediate

First-order kinetics

66. Which product is expected when 2-chlorobutane undergoes SN2 with NaOH?

1-butanol

2-butanol

Butene

Butanoic acid

67. Which base is typically used in E2 reactions?

CH₃OH

NH₃

H₂O

NaOH

68. Which of the following solvents favors SN2 reactions?

Water

Acetic acid

Acetone

Ethanol

69. In E2 reactions, how many molecules are involved in the rate-determining step?

One

None

Three

Two

70. Which statement is true about E1 reactions?

Occurs with strong bases only

One-step process

Needs non-polar solvent

Carbocation intermediate is formed

71. Which of the following reactions occurs in a single concerted step?

SN2

Acid hydrolysis

SN1

72. What is the general formula for alkyl halides?

CnH2n+2

CnHXn

CnH2nBr

CnH2n+1X

73. In SN2 reactions, the nucleophile attacks the substrate from the:

Back side

Front side

Below

Above

74. Which condition favors SN2 over SN1?

Polar protic solvent

Tertiary alkyl halide

Weak nucleophile

Strong nucleophile and primary alkyl halide

75. Which alkyl halide undergoes SN2 reaction most readily?

Ethyl chloride

Methyl chloride

Tert-butyl chloride

Isopropyl chloride

Page 4 of 4

76. Which of the following describes Zaitsev's Rule?

The halide leaves first

The more substituted alkene is the major product

The most stable carbocation forms first

The least substituted product is formed

77. In E2 reactions, how many molecules are involved in the rate-determining step?

Three

Two

None

One

78. Which is a characteristic of SN2 mechanism?

Carbocation intermediate

Rearrangement possible

First-order kinetics

Inversion of configuration

79. Which type of alkyl halide is most reactive in SN1 reactions?

Secondary

Methyl

Tertiary

Primary

80. In SN1 reactions, the rate of reaction depends on:

Temperature only

Concentration of alkyl halide only

Concentration of nucleophile only

Both nucleophile and alkyl halide

81. Which of the following is the correct IUPAC name for (CH₃)₃CBr?

1-bromobutane

2-bromo-2-methylpropane

2-bromobutane

Tert-butyl bromide

82. Which of the following favors E2 over E1?

Strong base and heat

Weak base

Low temperature

Polar protic solvent

83. What is the hybridization of the carbon atom bonded to the halogen in alkyl halides?

sp²d

sp²

sp³

84. Which product is formed in an E1 reaction from 2-butanol in acidic conditions?

Butane

Butanol

Butene

Butanoic acid

You Can Learn and Gain more Knowledge through our Online Quiz and Testing system Just Search your desired Preparation subject at Gotest.

Basic Concepts of Chemistry Online Mcqs Test
Chemistry Industrial Chemistry Online Mcqs Test
Chemistry Aldehydes and Ketones Online Mcqs Test
Chemistry Alcohols And Phenols Online Mcqs Test
Chemistry Macro Molecules Online Mcqs Test
Chemistry Carboxylic Acid Online Mcqs Test
Chemistry of Hydrocarbons Online Mcqs Test
Chemistry Transition Elements Online Mcqs Test
Chemistry Reaction Kinetics Online Mcqs Test
Fundamental Principles of Organic Chemistry Online Mcqs Test

Mustansar KhanLast Updated: October 14, 2025

Chemistry Alkyl Halides Online Mcqs Test

Important Chemistry Alkyl Halides Question and Answer

Chemistry Alkyl Halides Practice Test Online With Explanation

Uncategorized

Related Posts

Mustansar Khan

Leave a Reply Cancel reply