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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

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

SN2

SN1

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

Concerted elimination

Radical chain reaction

One-step with inversion

Two-step with carbocation intermediate

3. Which base is typically used in E2 reactions?

CH₃OH

NH₃

NaOH

H₂O

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

–NH₂

–CH₃

–Br

–OH

5. Which alkyl halide undergoes SN2 reaction most readily?

Tert-butyl chloride

Ethyl chloride

Methyl chloride

Isopropyl chloride

6. Which condition favors SN2 over SN1?

Weak nucleophile

Strong nucleophile and primary alkyl halide

Tertiary alkyl halide

Polar protic solvent

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

Butene

Butane

Butanol

Butanoic acid

8. Which statement is true about E1 reactions?

Carbocation intermediate is formed

Occurs with strong bases only

One-step process

Needs non-polar solvent

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

Tertiary bromide

Methyl chloride

Primary chloride

Secondary fluoride

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

SN2

SN1

Acid hydrolysis

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

SN2

SN1

E1cB

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

2-bromobutane

1-bromobutane

2-bromo-2-methylpropane

Tert-butyl bromide

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

Inversion

Backside attack

Rearrangement

One-step reaction

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

Linear

Tetrahedral

Trigonal bipyramidal

Trigonal planar

15. Which condition favors SN2 over SN1?

Polar protic solvent

Tertiary alkyl halide

Weak nucleophile

Strong nucleophile and primary alkyl halide

16. What is the general formula for alkyl halides?

CnH2nBr

CnH2n+2

CnHXn

CnH2n+1X

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

SN1

SN2

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

Nucleophile

Carbon

Halogen atom

Alkyl group

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

2-bromobutane

1-bromobutane

Methyl chloride

2-chloro-2-methylpropane

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

SN1

SN2

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

Back side

Above

Front side

Below

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

SN2

Addition

SN1

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

Two

One

None

Three

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

2-bromo-2-methylpropane

1-bromobutane

2-bromobutane

Tert-butyl bromide

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

Temperature only

Both nucleophile and alkyl halide

Concentration of nucleophile only

Concentration of alkyl halide only

Page 2 of 4

26. In an E2 reaction, the base removes:

A methyl group

The halogen

A β-hydrogen

A hydrogen on the same carbon

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

Propyl chloride

Isopropyl chloride

2-chloropropane

1-chloropropane

28. Which of the following solvents favors SN2 reactions?

Ethanol

Acetone

Water

Acetic acid

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

SN1

SN2

30. Which of the following solvents favors SN2 reactions?

Acetone

Water

Ethanol

Acetic acid

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

Nucleophile

Alkyl group

Carbon

Halogen atom

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

One-step with inversion

Radical chain reaction

Two-step with carbocation intermediate

Concerted elimination

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

CH₃CH₂Cl

(CH₃)₃CCl

CH₃CHClCH₃

CH₃Cl

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

Polar aprotic

Acidic

Non-polar

Polar protic

35. The stability of carbocations follows the order:

Primary > Secondary > Tertiary

Secondary > Tertiary > Primary

Tertiary > Secondary > Primary

Methyl > Tertiary > Secondary

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

1-chloropropane

Propyl chloride

2-chloropropane

Isopropyl chloride

37. Which alkyl halide undergoes SN2 reaction most readily?

Tert-butyl chloride

Methyl chloride

Ethyl chloride

Isopropyl chloride

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

Trigonal planar

Linear

Tetrahedral

Trigonal bipyramidal

39. Which of the following favors E2 over E1?

Weak base

Low temperature

Strong base and heat

Polar protic solvent

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

2-chloro-2-methylpropane

Methyl chloride

1-bromobutane

2-bromobutane

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

Acidic

Polar protic

Non-polar

Polar aprotic

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

sp²d

sp²

sp³

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

Retained

Inverted

Racemized

Rearranged

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

CH₃CHClCH₃

(CH₃)₃CCl

CH₃CH₂Cl

CH₃Cl

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

Isopropyl iodide

Tert-butyl bromide

Ethyl bromide

Methyl chloride

46. What is the general formula for alkyl halides?

CnHXn

CnH2n+1X

CnH2nBr

CnH2n+2

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

Bromine

Iodine

Chlorine

Fluorine

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

Pentanoic acid

2-pentanol

2-pentene

Pentane

49. Which base is typically used in E2 reactions?

NH₃

H₂O

NaOH

CH₃OH

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

SN1

SN2

E1cB

Page 3 of 4

51. Which condition favors elimination over substitution?

Cold temperature

Strong base and heat

Nonpolar solvent

Weak base

52. Which is a characteristic of SN2 mechanism?

Rearrangement possible

Carbocation intermediate

First-order kinetics

Inversion of configuration

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

–CH₃

–OH

–NH₂

–Br

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

Below

Front side

Above

Back side

55. Which condition favors elimination over substitution?

Strong base and heat

Weak base

Cold temperature

Nonpolar solvent

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

Backside attack

Inversion

Rearrangement

One-step reaction

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

Chlorine

Bromine

Iodine

Fluorine

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

Tert-butyl bromide

Methyl chloride

Ethyl bromide

Isopropyl iodide

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

Methyl

Tertiary

Secondary

Primary

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

Butanoic acid

2-butanol

1-butanol

Butene

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

1-butanol

Butene

Butanoic acid

2-butanol

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

SN2

Addition

SN1

63. Which factor increases the rate of SN1 reactions?

Polar protic solvent

Polar aprotic solvent

Strong nucleophile

Weak base

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

Secondary

Tertiary

Primary

Methyl

65. Which of the following favors E2 over E1?

Polar protic solvent

Weak base

Strong base and heat

Low temperature

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

Rearranged

Racemized

Inverted

Retained

67. Why is fluoride a poor leaving group?

It is too reactive

It is unstable

It is neutral

It forms strong C–F bonds

68. Which is a characteristic of SN2 mechanism?

Carbocation intermediate

Rearrangement possible

First-order kinetics

Inversion of configuration

69. 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

70. Why is fluoride a poor leaving group?

It is too reactive

It forms strong C–F bonds

It is unstable

It is neutral

71. In an E2 reaction, the base removes:

A hydrogen on the same carbon

A β-hydrogen

The halogen

A methyl group

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

None

One

Three

Two

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

Temperature only

Concentration of nucleophile only

Concentration of alkyl halide only

Both nucleophile and alkyl halide

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

sp²

sp²d

sp³

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

2-pentanol

2-pentene

Pentanoic acid

Pentane

Page 4 of 4

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

Butene

Butanoic acid

Butanol

Butane

77. Which factor increases the rate of SN1 reactions?

Strong nucleophile

Polar protic solvent

Polar aprotic solvent

Weak base

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

Methyl iodide

Isopropyl chloride

Ethyl bromide

Tert-butyl bromide

79. Which statement is true about E1 reactions?

Occurs with strong bases only

Needs non-polar solvent

One-step process

Carbocation intermediate is formed

80. The stability of carbocations follows the order:

Tertiary > Secondary > Primary

Primary > Secondary > Tertiary

Secondary > Tertiary > Primary

Methyl > Tertiary > Secondary

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

Tertiary bromide

Secondary fluoride

Methyl chloride

Primary chloride

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

Methyl iodide

Isopropyl chloride

Tert-butyl bromide

Ethyl bromide

83. 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

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

Acid hydrolysis

SN1

SN2

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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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