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.
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Chemistry Alkyl Halides Practice Test Online With Explanation

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Page 1 of 4

Uncategorized

1. Which condition favors SN2 over SN1?

Polar protic solvent

Tertiary alkyl halide

Weak nucleophile

Strong nucleophile and primary alkyl halide

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

Two

One

None

Three

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

Butene

2-butanol

1-butanol

Butanoic acid

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

–NH₂

–OH

–CH₃

–Br

5. Which of the following favors E2 over E1?

Strong base and heat

Low temperature

Polar protic solvent

Weak base

6. Which condition favors elimination over substitution?

Weak base

Nonpolar solvent

Strong base and heat

Cold temperature

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

Nucleophile

Alkyl group

Halogen atom

Carbon

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

SN1

E1cB

SN2

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

1-bromobutane

Methyl chloride

2-chloro-2-methylpropane

2-bromobutane

10. Which base is typically used in E2 reactions?

NH₃

CH₃OH

H₂O

NaOH

11. Which is a characteristic of SN2 mechanism?

Inversion of configuration

Rearrangement possible

Carbocation intermediate

First-order kinetics

12. Why is fluoride a poor leaving group?

It is neutral

It forms strong C–F bonds

It is too reactive

It is unstable

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

SN1

SN2

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

SN2

SN1

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

CH₃CHClCH₃

(CH₃)₃CCl

CH₃Cl

CH₃CH₂Cl

16. Which statement is true about E1 reactions?

Needs non-polar solvent

Occurs with strong bases only

Carbocation intermediate is formed

One-step process

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

1-chloropropane

2-chloropropane

Propyl chloride

Isopropyl chloride

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

SN1

SN2

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

Inversion

Backside attack

One-step reaction

Rearrangement

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

Both nucleophile and alkyl halide

Temperature only

Concentration of alkyl halide only

Concentration of nucleophile only

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

Halogen atom

Alkyl group

Nucleophile

Carbon

22. Which alkyl halide undergoes SN2 reaction most readily?

Methyl chloride

Tert-butyl chloride

Isopropyl chloride

Ethyl chloride

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

Acid hydrolysis

SN2

SN1

24. Which of the following solvents favors SN2 reactions?

Acetic acid

Water

Acetone

Ethanol

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

The more substituted alkene is the major product

The least substituted product is formed

The halide leaves first

The most stable carbocation forms first

Page 2 of 4

26. In an E2 reaction, the base removes:

A hydrogen on the same carbon

A β-hydrogen

The halogen

A methyl group

27. What is the general formula for alkyl halides?

CnH2n+1X

CnH2n+2

CnHXn

CnH2nBr

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

(CH₃)₃CCl

CH₃Cl

CH₃CH₂Cl

CH₃CHClCH₃

29. The stability of carbocations follows the order:

Secondary > Tertiary > Primary

Tertiary > Secondary > Primary

Methyl > Tertiary > Secondary

Primary > Secondary > Tertiary

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

Front side

Below

Above

Back side

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

Inverted

Racemized

Rearranged

Retained

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

–NH₂

–OH

–CH₃

–Br

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

SN1

Addition

SN2

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

Isopropyl chloride

Tert-butyl bromide

Ethyl bromide

Methyl iodide

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

Polar aprotic

Non-polar

Polar protic

Acidic

36. Which of the following solvents favors SN2 reactions?

Acetic acid

Ethanol

Acetone

Water

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

Pentane

2-pentene

Pentanoic acid

2-pentanol

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

Racemized

Retained

Inverted

Rearranged

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

1-chloropropane

Propyl chloride

2-chloropropane

Isopropyl chloride

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

Concerted elimination

One-step with inversion

Radical chain reaction

Two-step with carbocation intermediate

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

Trigonal bipyramidal

Linear

Trigonal planar

Tetrahedral

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

Butanol

Butanoic acid

Butane

Butene

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

2-chloro-2-methylpropane

2-bromobutane

1-bromobutane

Methyl chloride

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

Methyl iodide

Isopropyl chloride

Ethyl bromide

Tert-butyl bromide

45. Which of the following favors E2 over E1?

Low temperature

Polar protic solvent

Strong base and heat

Weak base

46. Which alkyl halide undergoes SN2 reaction most readily?

Methyl chloride

Ethyl chloride

Tert-butyl chloride

Isopropyl chloride

47. Which factor increases the rate of SN1 reactions?

Polar aprotic solvent

Polar protic solvent

Weak base

Strong nucleophile

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

Tertiary

Methyl

Primary

Secondary

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

Trigonal bipyramidal

Trigonal planar

Tetrahedral

Linear

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

Methyl chloride

Primary chloride

Secondary fluoride

Tertiary bromide

Page 3 of 4

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

The halide leaves first

The most stable carbocation forms first

The least substituted product is formed

The more substituted alkene is the major product

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

SN1

SN2

Addition

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

SN2

E1cB

SN1

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

Front side

Back side

Below

Above

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

SN2

SN1

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

Butanoic acid

Butane

Butene

Butanol

57. Which condition favors SN2 over SN1?

Weak nucleophile

Polar protic solvent

Tertiary alkyl halide

Strong nucleophile and primary alkyl halide

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

Chlorine

Fluorine

Bromine

Iodine

59. What is the general formula for alkyl halides?

CnH2n+2

CnHXn

CnH2n+1X

CnH2nBr

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

Methyl chloride

Ethyl bromide

Isopropyl iodide

Tert-butyl bromide

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

1-butanol

2-butanol

Butanoic acid

Butene

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

sp³

sp²d

sp²

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

2-pentene

Pentanoic acid

Pentane

2-pentanol

64. Which statement is true about E1 reactions?

Occurs with strong bases only

Needs non-polar solvent

One-step process

Carbocation intermediate is formed

65. Why is fluoride a poor leaving group?

It is neutral

It forms strong C–F bonds

It is unstable

It is too reactive

66. Which base is typically used in E2 reactions?

CH₃OH

NH₃

NaOH

H₂O

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

sp²

sp³

sp²d

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

Two-step with carbocation intermediate

One-step with inversion

Concerted elimination

Radical chain reaction

69. Which factor increases the rate of SN1 reactions?

Polar protic solvent

Weak base

Polar aprotic solvent

Strong nucleophile

70. Which condition favors elimination over substitution?

Cold temperature

Nonpolar solvent

Weak base

Strong base and heat

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

1-bromobutane

2-bromo-2-methylpropane

Tert-butyl bromide

2-bromobutane

72. Which is a characteristic of SN2 mechanism?

Carbocation intermediate

Inversion of configuration

First-order kinetics

Rearrangement possible

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

Fluorine

Chlorine

Bromine

Iodine

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

Methyl chloride

Ethyl bromide

Tert-butyl bromide

Isopropyl iodide

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

Inversion

Rearrangement

Backside attack

One-step reaction

Page 4 of 4

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

2-bromo-2-methylpropane

1-bromobutane

Tert-butyl bromide

2-bromobutane

77. The stability of carbocations follows the order:

Methyl > Tertiary > Secondary

Tertiary > Secondary > Primary

Primary > Secondary > Tertiary

Secondary > Tertiary > Primary

78. In an E2 reaction, the base removes:

A methyl group

The halogen

A β-hydrogen

A hydrogen on the same carbon

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

Secondary

Tertiary

Methyl

Primary

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

Polar protic

Polar aprotic

Non-polar

Acidic

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

Two

None

Three

One

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

SN2

SN1

Acid hydrolysis

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

Both nucleophile and alkyl halide

Temperature only

Concentration of alkyl halide only

Concentration of nucleophile only

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

Methyl chloride

Primary chloride

Secondary fluoride

Tertiary bromide

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Mustansar KhanLast Updated: October 14, 2025

Important Chemistry Alkyl Halides Question and Answer

Chemistry Alkyl Halides Practice Test Online With Explanation

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