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 halogen is the most reactive in alkyl halides?

Iodine

Fluorine

Bromine

Chlorine

2. Which condition favors SN2 over SN1?

Strong nucleophile and primary alkyl halide

Polar protic solvent

Weak nucleophile

Tertiary alkyl halide

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

sp²d

sp³

sp²

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

Below

Above

Back side

Front side

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

Concerted elimination

Radical chain reaction

One-step with inversion

Two-step with carbocation intermediate

6. The stability of carbocations follows the order:

Primary > Secondary > Tertiary

Secondary > Tertiary > Primary

Methyl > Tertiary > Secondary

Tertiary > Secondary > Primary

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

E1cB

SN1

SN2

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

Tert-butyl bromide

1-bromobutane

2-bromobutane

2-bromo-2-methylpropane

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

Isopropyl chloride

Tert-butyl bromide

Methyl iodide

Ethyl bromide

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

Concentration of alkyl halide only

Both nucleophile and alkyl halide

Concentration of nucleophile only

Temperature only

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

Pentanoic acid

2-pentene

Pentane

2-pentanol

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

Fluorine

Bromine

Iodine

Chlorine

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

Inversion

Rearrangement

One-step reaction

Backside attack

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

The least substituted product is formed

The more substituted alkene is the major product

The most stable carbocation forms first

The halide leaves first

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

SN1

E1cB

SN2

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

CH₃Cl

(CH₃)₃CCl

CH₃CH₂Cl

CH₃CHClCH₃

17. Which statement is true about E1 reactions?

Occurs with strong bases only

One-step process

Carbocation intermediate is formed

Needs non-polar solvent

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

SN2

SN1

Addition

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

–NH₂

–CH₃

–Br

–OH

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

SN1

SN2

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

Tetrahedral

Trigonal planar

Trigonal bipyramidal

Linear

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

1-chloropropane

Propyl chloride

2-chloropropane

Isopropyl chloride

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

Acidic

Polar protic

Non-polar

Polar aprotic

24. In an E2 reaction, the base removes:

A β-hydrogen

A hydrogen on the same carbon

A methyl group

The halogen

25. Why is fluoride a poor leaving group?

It is too reactive

It forms strong C–F bonds

It is unstable

It is neutral

Page 2 of 4

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

Tert-butyl bromide

2-bromo-2-methylpropane

1-bromobutane

2-bromobutane

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

Tert-butyl bromide

Ethyl bromide

Methyl iodide

Isopropyl chloride

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

sp³

sp²

sp²d

29. Which of the following favors E2 over E1?

Polar protic solvent

Strong base and heat

Low temperature

Weak base

30. What is the general formula for alkyl halides?

CnH2n+2

CnH2n+1X

CnH2nBr

CnHXn

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

1-chloropropane

Propyl chloride

Isopropyl chloride

2-chloropropane

32. Which factor increases the rate of SN1 reactions?

Polar aprotic solvent

Weak base

Polar protic solvent

Strong nucleophile

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

1-butanol

Butene

2-butanol

Butanoic acid

34. Which of the following solvents favors SN2 reactions?

Water

Acetone

Acetic acid

Ethanol

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

1-bromobutane

Methyl chloride

2-bromobutane

2-chloro-2-methylpropane

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

Retained

Racemized

Rearranged

Inverted

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

SN2

SN1

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

Acid hydrolysis

SN1

SN2

39. Which factor increases the rate of SN1 reactions?

Strong nucleophile

Weak base

Polar protic solvent

Polar aprotic solvent

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

Trigonal bipyramidal

Linear

Trigonal planar

Tetrahedral

41. In an E2 reaction, the base removes:

The halogen

A methyl group

A hydrogen on the same carbon

A β-hydrogen

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

Tertiary

Methyl

Secondary

Primary

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

Concentration of alkyl halide only

Concentration of nucleophile only

Temperature only

Both nucleophile and alkyl halide

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

SN1

SN2

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

SN1

Acid hydrolysis

SN2

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

Methyl

Primary

Tertiary

Secondary

47. Which is a characteristic of SN2 mechanism?

First-order kinetics

Inversion of configuration

Rearrangement possible

Carbocation intermediate

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

1-butanol

Butanoic acid

Butene

2-butanol

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

Back side

Front side

Above

Below

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

Butane

Butanoic acid

Butanol

Butene

Page 3 of 4

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

Two

One

Three

None

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

Rearrangement

One-step reaction

Backside attack

Inversion

53. Which alkyl halide undergoes SN2 reaction most readily?

Isopropyl chloride

Tert-butyl chloride

Methyl chloride

Ethyl chloride

54. What is the general formula for alkyl halides?

CnH2n+2

CnHXn

CnH2n+1X

CnH2nBr

55. Which statement is true about E1 reactions?

Carbocation intermediate is formed

Occurs with strong bases only

Needs non-polar solvent

One-step process

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

–CH₃

–OH

–Br

–NH₂

57. Which of the following solvents favors SN2 reactions?

Acetic acid

Water

Ethanol

Acetone

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

Isopropyl iodide

Methyl chloride

Ethyl bromide

Tert-butyl bromide

59. Which base is typically used in E2 reactions?

H₂O

NaOH

NH₃

CH₃OH

60. 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

61. Which is a characteristic of SN2 mechanism?

First-order kinetics

Rearrangement possible

Carbocation intermediate

Inversion of configuration

62. Which condition favors SN2 over SN1?

Strong nucleophile and primary alkyl halide

Polar protic solvent

Tertiary alkyl halide

Weak nucleophile

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

SN1

SN2

Addition

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

Halogen atom

Nucleophile

Carbon

Alkyl group

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

Methyl chloride

Secondary fluoride

Tertiary bromide

Primary chloride

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

2-chloro-2-methylpropane

Methyl chloride

1-bromobutane

2-bromobutane

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

Alkyl group

Nucleophile

Carbon

Halogen atom

68. Which condition favors elimination over substitution?

Cold temperature

Strong base and heat

Weak base

Nonpolar solvent

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

Butene

Butanol

Butanoic acid

Butane

70. Why is fluoride a poor leaving group?

It is neutral

It is unstable

It forms strong C–F bonds

It is too reactive

71. Which condition favors elimination over substitution?

Strong base and heat

Nonpolar solvent

Cold temperature

Weak base

72. Which base is typically used in E2 reactions?

NH₃

NaOH

H₂O

CH₃OH

73. Which of the following favors E2 over E1?

Low temperature

Weak base

Polar protic solvent

Strong base and heat

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

Pentane

2-pentene

Pentanoic acid

2-pentanol

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

Tertiary bromide

Secondary fluoride

Methyl chloride

Primary chloride

Page 4 of 4

76. Which alkyl halide undergoes SN2 reaction most readily?

Ethyl chloride

Tert-butyl chloride

Isopropyl chloride

Methyl chloride

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

Two

None

Three

One

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

CH₃Cl

(CH₃)₃CCl

CH₃CH₂Cl

CH₃CHClCH₃

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

Radical chain reaction

Concerted elimination

Two-step with carbocation intermediate

One-step with inversion

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

Tert-butyl bromide

Methyl chloride

Isopropyl iodide

Ethyl bromide

81. The stability of carbocations follows the order:

Secondary > Tertiary > Primary

Methyl > Tertiary > Secondary

Tertiary > Secondary > Primary

Primary > Secondary > Tertiary

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

Non-polar

Polar aprotic

Acidic

Polar protic

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

Rearranged

Retained

Racemized

Inverted

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

SN1

SN2

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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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