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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

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Page 1 of 4

Uncategorized

1. Which base is typically used in E2 reactions?

NaOH

H₂O

NH₃

CH₃OH

2. Which of the following favors E2 over E1?

Polar protic solvent

Strong base and heat

Low temperature

Weak base

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

Radical chain reaction

Concerted elimination

One-step with inversion

Two-step with carbocation intermediate

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

1-butanol

Butanoic acid

Butene

2-butanol

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

Concentration of alkyl halide only

Both nucleophile and alkyl halide

Temperature only

Concentration of nucleophile only

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

Butanoic acid

Butene

Butane

Butanol

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

2-bromobutane

1-bromobutane

Tert-butyl bromide

2-bromo-2-methylpropane

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

Tert-butyl bromide

Isopropyl chloride

Ethyl bromide

Methyl iodide

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

E1cB

SN2

SN1

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

Three

One

Two

None

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

Butanoic acid

2-butanol

Butene

1-butanol

12. What is the general formula for alkyl halides?

CnH2n+1X

CnH2nBr

CnHXn

CnH2n+2

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

Polar aprotic

Polar protic

Non-polar

Acidic

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

sp²d

sp³

sp²

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

CH₃Cl

CH₃CH₂Cl

(CH₃)₃CCl

CH₃CHClCH₃

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

Fluorine

Chlorine

Iodine

Bromine

17. Which is a characteristic of SN2 mechanism?

First-order kinetics

Inversion of configuration

Rearrangement possible

Carbocation intermediate

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

Concentration of nucleophile only

Temperature only

Concentration of alkyl halide only

Both nucleophile and alkyl halide

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

–NH₂

–Br

–CH₃

–OH

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

Rearranged

Inverted

Racemized

Retained

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

Back side

Above

Below

Front side

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

Front side

Below

Above

Back side

23. Which alkyl halide undergoes SN2 reaction most readily?

Tert-butyl chloride

Isopropyl chloride

Methyl chloride

Ethyl chloride

24. Which alkyl halide undergoes SN2 reaction most readily?

Ethyl chloride

Tert-butyl chloride

Methyl chloride

Isopropyl chloride

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

Linear

Tetrahedral

Trigonal bipyramidal

Trigonal planar

Page 2 of 4

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

Inversion

Rearrangement

One-step reaction

Backside attack

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

Non-polar

Polar protic

Polar aprotic

Acidic

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

Addition

SN2

SN1

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

One-step with inversion

Radical chain reaction

Concerted elimination

Two-step with carbocation intermediate

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

Tert-butyl bromide

2-bromo-2-methylpropane

1-bromobutane

2-bromobutane

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

CH₃CH₂Cl

CH₃Cl

CH₃CHClCH₃

(CH₃)₃CCl

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

Secondary fluoride

Tertiary bromide

Methyl chloride

Primary chloride

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

Butanoic acid

Butene

Butane

Butanol

34. Why is fluoride a poor leaving group?

It is too reactive

It forms strong C–F bonds

It is unstable

It is neutral

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

–Br

–OH

–CH₃

–NH₂

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

The more substituted alkene is the major product

The least substituted product is formed

The most stable carbocation forms first

The halide leaves first

37. Which condition favors elimination over substitution?

Weak base

Nonpolar solvent

Strong base and heat

Cold temperature

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

Propyl chloride

2-chloropropane

Isopropyl chloride

1-chloropropane

39. Which of the following favors E2 over E1?

Low temperature

Polar protic solvent

Weak base

Strong base and heat

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

Carbon

Nucleophile

Alkyl group

Halogen atom

41. In an E2 reaction, the base removes:

A methyl group

A hydrogen on the same carbon

A β-hydrogen

The halogen

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

SN2

SN1

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

2-chloropropane

1-chloropropane

Propyl chloride

Isopropyl chloride

44. Which statement is true about E1 reactions?

Occurs with strong bases only

One-step process

Needs non-polar solvent

Carbocation intermediate is formed

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

SN2

Acid hydrolysis

SN1

46. Which condition favors SN2 over SN1?

Tertiary alkyl halide

Polar protic solvent

Strong nucleophile and primary alkyl halide

Weak nucleophile

47. The stability of carbocations follows the order:

Secondary > Tertiary > Primary

Tertiary > Secondary > Primary

Methyl > Tertiary > Secondary

Primary > Secondary > Tertiary

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

Methyl chloride

Primary chloride

Secondary fluoride

Tertiary bromide

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

SN2

SN1

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

SN1

SN2

Page 3 of 4

51. Which statement is true about E1 reactions?

Carbocation intermediate is formed

One-step process

Needs non-polar solvent

Occurs with strong bases only

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

2-bromobutane

Methyl chloride

1-bromobutane

2-chloro-2-methylpropane

53. Which is a characteristic of SN2 mechanism?

Inversion of configuration

First-order kinetics

Carbocation intermediate

Rearrangement possible

54. What is the general formula for alkyl halides?

CnH2n+1X

CnH2n+2

CnH2nBr

CnHXn

55. Which of the following solvents favors SN2 reactions?

Water

Ethanol

Acetic acid

Acetone

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

Pentanoic acid

Pentane

2-pentene

2-pentanol

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

Inversion

One-step reaction

Backside attack

Rearrangement

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

Linear

Tetrahedral

Trigonal bipyramidal

Trigonal planar

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

2-pentanol

2-pentene

Pentane

Pentanoic acid

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

SN1

SN2

Acid hydrolysis

61. Which of the following solvents favors SN2 reactions?

Ethanol

Water

Acetic acid

Acetone

62. Which factor increases the rate of SN1 reactions?

Polar protic solvent

Strong nucleophile

Weak base

Polar aprotic solvent

63. Which base is typically used in E2 reactions?

H₂O

CH₃OH

NaOH

NH₃

64. Why is fluoride a poor leaving group?

It is neutral

It is unstable

It forms strong C–F bonds

It is too reactive

65. In an E2 reaction, the base removes:

A methyl group

The halogen

A β-hydrogen

A hydrogen on the same carbon

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

Rearranged

Inverted

Racemized

Retained

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

SN1

E1cB

SN2

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

Methyl

Primary

Secondary

Tertiary

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

sp²

sp²d

sp³

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

Isopropyl iodide

Methyl chloride

Tert-butyl bromide

Ethyl bromide

71. Which condition favors SN2 over SN1?

Polar protic solvent

Tertiary alkyl halide

Strong nucleophile and primary alkyl halide

Weak nucleophile

72. Which condition favors elimination over substitution?

Weak base

Nonpolar solvent

Strong base and heat

Cold temperature

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

Methyl chloride

Tert-butyl bromide

Ethyl bromide

Isopropyl iodide

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

Two

None

Three

One

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

SN1

SN2

Addition

Page 4 of 4

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

Halogen atom

Carbon

Alkyl group

Nucleophile

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

2-bromobutane

Methyl chloride

1-bromobutane

2-chloro-2-methylpropane

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

The least substituted product is formed

The halide leaves first

The more substituted alkene is the major product

The most stable carbocation forms first

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

Primary

Tertiary

Methyl

Secondary

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

Bromine

Iodine

Fluorine

Chlorine

81. Which factor increases the rate of SN1 reactions?

Strong nucleophile

Polar aprotic solvent

Weak base

Polar protic solvent

82. The stability of carbocations follows the order:

Primary > Secondary > Tertiary

Tertiary > Secondary > Primary

Secondary > Tertiary > Primary

Methyl > Tertiary > Secondary

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

SN2

SN1

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

Methyl iodide

Ethyl bromide

Isopropyl chloride

Tert-butyl bromide

Complete Guide for Chemistry Alkyl Halides Online Mcqs Test

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Important Chemistry Alkyl Halides Question and Answer

Chemistry Alkyl Halides Practice Test Online With Explanation

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Complete Guide for Chemistry Alkyl Halides Online Mcqs Test

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