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MDCAT Chemistry Alkyl Halides Test Online

Mustansar KhanLast Updated: June 16, 2025

Chemistry Alkyl Halides MCQS Online Test

MDCAT Chemistry Alkyl Halides Chapter Online Test

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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MDCAT Chemistry Alkyl Halides Test

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Page 1 of 4

Uncategorized

1. Which base is typically used in E2 reactions?

NH₃

NaOH

CH₃OH

H₂O

2. The stability of carbocations follows the order:

Primary > Secondary > Tertiary

Methyl > Tertiary > Secondary

Secondary > Tertiary > Primary

Tertiary > Secondary > Primary

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

Secondary

Tertiary

Primary

Methyl

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

Chlorine

Bromine

Iodine

Fluorine

5. 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

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

Acidic

Non-polar

Polar protic

Polar aprotic

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

Butane

Butene

Butanol

Butanoic acid

8. Which alkyl halide undergoes SN2 reaction most readily?

Tert-butyl chloride

Methyl chloride

Isopropyl chloride

Ethyl chloride

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

One-step reaction

Backside attack

Rearrangement

Inversion

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

SN2

SN1

E1cB

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

Halogen atom

Nucleophile

Carbon

Alkyl group

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

Polar protic

Acidic

Polar aprotic

Non-polar

13. 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

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

Propyl chloride

Isopropyl chloride

1-chloropropane

2-chloropropane

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

One-step with inversion

Radical chain reaction

Two-step with carbocation intermediate

Concerted elimination

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

One

Two

None

Three

17. What is the general formula for alkyl halides?

CnH2nBr

CnHXn

CnH2n+1X

CnH2n+2

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

2-bromobutane

Tert-butyl bromide

1-bromobutane

2-bromo-2-methylpropane

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

Inversion

Backside attack

Rearrangement

One-step reaction

20. In an E2 reaction, the base removes:

The halogen

A methyl group

A hydrogen on the same carbon

A β-hydrogen

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

sp²d

sp²

sp³

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

Two

One

Three

None

23. Which condition favors SN2 over SN1?

Polar protic solvent

Weak nucleophile

Tertiary alkyl halide

Strong nucleophile and primary alkyl halide

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

Butene

Butanoic acid

1-butanol

2-butanol

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

SN1

SN2

Page 2 of 4

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

CH₃CH₂Cl

CH₃CHClCH₃

CH₃Cl

(CH₃)₃CCl

27. Which is a characteristic of SN2 mechanism?

Carbocation intermediate

Inversion of configuration

Rearrangement possible

First-order kinetics

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

Iodine

Chlorine

Fluorine

Bromine

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

Pentane

2-pentene

Pentanoic acid

2-pentanol

30. Which of the following solvents favors SN2 reactions?

Ethanol

Acetone

Water

Acetic acid

31. Which condition favors SN2 over SN1?

Tertiary alkyl halide

Polar protic solvent

Weak nucleophile

Strong nucleophile and primary alkyl halide

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

Isopropyl chloride

Methyl iodide

Ethyl bromide

Tert-butyl bromide

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

–NH₂

–Br

–CH₃

–OH

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

Butene

1-butanol

Butanoic acid

2-butanol

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

Concentration of nucleophile only

Temperature only

Both nucleophile and alkyl halide

Concentration of alkyl halide only

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

Retained

Rearranged

Racemized

Inverted

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

Secondary fluoride

Tertiary bromide

Primary chloride

Methyl chloride

38. Why is fluoride a poor leaving group?

It is neutral

It forms strong C–F bonds

It is too reactive

It is unstable

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

SN2

Addition

SN1

40. Which is a characteristic of SN2 mechanism?

Carbocation intermediate

First-order kinetics

Rearrangement possible

Inversion of configuration

41. Which of the following solvents favors SN2 reactions?

Water

Acetic acid

Ethanol

Acetone

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

Ethyl bromide

Tert-butyl bromide

Methyl chloride

Isopropyl iodide

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

Methyl chloride

Secondary fluoride

Tertiary bromide

Primary chloride

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

Methyl chloride

Ethyl bromide

Isopropyl iodide

Tert-butyl bromide

45. In an E2 reaction, the base removes:

A β-hydrogen

A methyl group

A hydrogen on the same carbon

The halogen

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

Front side

Back side

Above

Below

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

Isopropyl chloride

1-chloropropane

2-chloropropane

Propyl chloride

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

Pentane

2-pentanol

Pentanoic acid

2-pentene

49. The stability of carbocations follows the order:

Primary > Secondary > Tertiary

Tertiary > Secondary > Primary

Methyl > Tertiary > Secondary

Secondary > Tertiary > Primary

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

Tetrahedral

Linear

Trigonal planar

Trigonal bipyramidal

Page 3 of 4

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

2-chloro-2-methylpropane

Methyl chloride

2-bromobutane

1-bromobutane

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

Methyl iodide

Ethyl bromide

Tert-butyl bromide

Isopropyl chloride

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

SN2

SN1

Acid hydrolysis

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

–CH₃

–Br

–OH

–NH₂

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

SN1

SN2

56. What is the general formula for alkyl halides?

CnH2n+2

CnH2n+1X

CnHXn

CnH2nBr

57. Which of the following favors E2 over E1?

Polar protic solvent

Weak base

Low temperature

Strong base and heat

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

Methyl chloride

2-bromobutane

2-chloro-2-methylpropane

1-bromobutane

59. Which base is typically used in E2 reactions?

H₂O

NH₃

CH₃OH

NaOH

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

sp²d

sp²

sp³

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

Rearranged

Racemized

Retained

Inverted

62. Why is fluoride a poor leaving group?

It is too reactive

It is unstable

It forms strong C–F bonds

It is neutral

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

SN2

SN1

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

Front side

Back side

Above

Below

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

2-bromobutane

2-bromo-2-methylpropane

1-bromobutane

Tert-butyl bromide

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

CH₃CH₂Cl

(CH₃)₃CCl

CH₃CHClCH₃

CH₃Cl

67. Which statement is true about E1 reactions?

Carbocation intermediate is formed

Needs non-polar solvent

Occurs with strong bases only

One-step process

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

SN2

SN1

Addition

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

SN2

E1cB

SN1

70. Which statement is true about E1 reactions?

Carbocation intermediate is formed

One-step process

Needs non-polar solvent

Occurs with strong bases only

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

The most stable carbocation forms first

The more substituted alkene is the major product

The halide leaves first

The least substituted product is formed

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

SN2

SN1

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

Trigonal bipyramidal

Linear

Tetrahedral

Trigonal planar

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

Primary

Methyl

Secondary

Tertiary

75. Which factor increases the rate of SN1 reactions?

Weak base

Strong nucleophile

Polar protic solvent

Polar aprotic solvent

Page 4 of 4

76. Which condition favors elimination over substitution?

Strong base and heat

Cold temperature

Weak base

Nonpolar solvent

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

Concerted elimination

Two-step with carbocation intermediate

Radical chain reaction

One-step with inversion

78. Which alkyl halide undergoes SN2 reaction most readily?

Methyl chloride

Tert-butyl chloride

Ethyl chloride

Isopropyl chloride

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

Nucleophile

Halogen atom

Alkyl group

Carbon

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

SN1

SN2

Acid hydrolysis

81. Which of the following favors E2 over E1?

Strong base and heat

Weak base

Low temperature

Polar protic solvent

82. Which condition favors elimination over substitution?

Cold temperature

Weak base

Strong base and heat

Nonpolar solvent

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

Butanol

Butane

Butene

Butanoic acid

84. Which factor increases the rate of SN1 reactions?

Polar protic solvent

Strong nucleophile

Polar aprotic solvent

Weak base

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Mustansar KhanLast Updated: June 16, 2025

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MDCAT Chemistry Alkyl Halides Test Online

Chemistry Alkyl Halides MCQS Online Test

MDCAT Chemistry Alkyl Halides Chapter Online Test

MDCAT Chemistry Alkyl Halides Test

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Chemistry Alkyl Halides MCQS Online Test

MDCAT Chemistry Alkyl Halides Chapter Online Test

MDCAT Chemistry Alkyl Halides Test

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