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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 of the following is the correct IUPAC name for CH₃CH₂CH₂Cl?

Isopropyl chloride

1-chloropropane

2-chloropropane

Propyl chloride

2. Which is a characteristic of SN2 mechanism?

Inversion of configuration

Carbocation intermediate

First-order kinetics

Rearrangement possible

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

Isopropyl iodide

Ethyl bromide

Methyl chloride

Tert-butyl bromide

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

Fluorine

Iodine

Chlorine

Bromine

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

Butene

Butanol

Butane

Butanoic acid

6. Which alkyl halide undergoes SN2 reaction most readily?

Ethyl chloride

Isopropyl chloride

Methyl chloride

Tert-butyl chloride

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

SN2

Acid hydrolysis

SN1

8. Which of the following solvents favors SN2 reactions?

Acetone

Acetic acid

Water

Ethanol

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

The more substituted alkene is the major product

The halide leaves first

The least substituted product is formed

The most stable carbocation forms first

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

2-bromobutane

2-chloro-2-methylpropane

1-bromobutane

Methyl chloride

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

Both nucleophile and alkyl halide

Concentration of nucleophile only

Concentration of alkyl halide only

Temperature only

12. The stability of carbocations follows the order:

Secondary > Tertiary > Primary

Primary > Secondary > Tertiary

Methyl > Tertiary > Secondary

Tertiary > Secondary > Primary

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

Tert-butyl bromide

Isopropyl iodide

Methyl chloride

Ethyl bromide

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

Secondary fluoride

Tertiary bromide

Primary chloride

Methyl chloride

15. Which of the following favors E2 over E1?

Weak base

Low temperature

Strong base and heat

Polar protic solvent

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

sp³

sp²

sp²d

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

Front side

Above

Below

Back side

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

Racemized

Inverted

Rearranged

Retained

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

2-bromo-2-methylpropane

Tert-butyl bromide

2-bromobutane

1-bromobutane

20. What is the general formula for alkyl halides?

CnH2nBr

CnHXn

CnH2n+1X

CnH2n+2

21. In an E2 reaction, the base removes:

A methyl group

A hydrogen on the same carbon

The halogen

A β-hydrogen

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

SN1

SN2

Addition

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

CH₃CH₂Cl

CH₃CHClCH₃

CH₃Cl

(CH₃)₃CCl

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

Acid hydrolysis

SN1

SN2

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

2-pentanol

Pentanoic acid

Pentane

2-pentene

Page 2 of 4

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

SN2

SN1

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

2-pentanol

Pentanoic acid

Pentane

2-pentene

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

E1cB

SN2

SN1

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

Two

Three

None

One

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

Rearranged

Inverted

Racemized

Retained

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

SN2

SN1

Addition

32. Which condition favors SN2 over SN1?

Strong nucleophile and primary alkyl halide

Polar protic solvent

Weak nucleophile

Tertiary alkyl halide

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

Methyl

Primary

Tertiary

Secondary

34. Which condition favors elimination over substitution?

Nonpolar solvent

Strong base and heat

Cold temperature

Weak base

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

Butene

Butanoic acid

2-butanol

1-butanol

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

–NH₂

–CH₃

–OH

–Br

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

Inversion

Rearrangement

Backside attack

One-step reaction

38. Which alkyl halide undergoes SN2 reaction most readily?

Ethyl chloride

Isopropyl chloride

Tert-butyl chloride

Methyl chloride

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

2-bromobutane

Tert-butyl bromide

2-bromo-2-methylpropane

1-bromobutane

40. In an E2 reaction, the base removes:

The halogen

A β-hydrogen

A hydrogen on the same carbon

A methyl group

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

Below

Back side

Above

Front side

42. Which of the following favors E2 over E1?

Low temperature

Strong base and heat

Polar protic solvent

Weak base

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

Trigonal planar

Tetrahedral

Linear

Trigonal bipyramidal

44. Why is fluoride a poor leaving group?

It is too reactive

It is unstable

It forms strong C–F bonds

It is neutral

45. Which factor increases the rate of SN1 reactions?

Strong nucleophile

Weak base

Polar aprotic solvent

Polar protic solvent

46. Which statement is true about E1 reactions?

Needs non-polar solvent

Occurs with strong bases only

Carbocation intermediate is formed

One-step process

47. What is the general formula for alkyl halides?

CnH2n+2

CnH2nBr

CnHXn

CnH2n+1X

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

–Br

–NH₂

–OH

–CH₃

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

CH₃Cl

CH₃CHClCH₃

(CH₃)₃CCl

CH₃CH₂Cl

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

Carbon

Alkyl group

Halogen atom

Nucleophile

Page 3 of 4

51. Which statement is true about E1 reactions?

One-step process

Needs non-polar solvent

Occurs with strong bases only

Carbocation intermediate is formed

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

1-butanol

2-butanol

Butanoic acid

Butene

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

None

Three

Two

One

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

Rearrangement

Backside attack

One-step reaction

Inversion

55. Which of the following solvents favors SN2 reactions?

Acetic acid

Acetone

Ethanol

Water

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

Methyl chloride

Primary chloride

Secondary fluoride

Tertiary bromide

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

Methyl iodide

Tert-butyl bromide

Ethyl bromide

Isopropyl chloride

58. Which condition favors SN2 over SN1?

Weak nucleophile

Tertiary alkyl halide

Polar protic solvent

Strong nucleophile and primary alkyl halide

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

1-chloropropane

2-chloropropane

Isopropyl chloride

Propyl chloride

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

Methyl iodide

Ethyl bromide

Isopropyl chloride

Tert-butyl bromide

61. Which base is typically used in E2 reactions?

NaOH

H₂O

CH₃OH

NH₃

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

SN2

SN1

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

SN2

SN1

64. Why is fluoride a poor leaving group?

It is too reactive

It is neutral

It is unstable

It forms strong C–F bonds

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

Concerted elimination

Two-step with carbocation intermediate

Radical chain reaction

One-step with inversion

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

2-bromobutane

Methyl chloride

1-bromobutane

2-chloro-2-methylpropane

67. 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

68. Which factor increases the rate of SN1 reactions?

Polar aprotic solvent

Strong nucleophile

Polar protic solvent

Weak base

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

Fluorine

Chlorine

Iodine

Bromine

70. 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

71. Which base is typically used in E2 reactions?

H₂O

NaOH

NH₃

CH₃OH

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

Acidic

Polar aprotic

Non-polar

Polar protic

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

Butanoic acid

Butanol

Butane

Butene

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

Non-polar

Polar protic

Polar aprotic

Acidic

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

Halogen atom

Nucleophile

Alkyl group

Carbon

Page 4 of 4

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

sp²

sp²d

sp³

77. Which is a characteristic of SN2 mechanism?

First-order kinetics

Inversion of configuration

Rearrangement possible

Carbocation intermediate

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

Methyl

Primary

Secondary

Tertiary

79. Which condition favors elimination over substitution?

Cold temperature

Nonpolar solvent

Weak base

Strong base and heat

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

SN2

SN1

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

Trigonal bipyramidal

Tetrahedral

Linear

Trigonal planar

82. The stability of carbocations follows the order:

Primary > Secondary > Tertiary

Secondary > Tertiary > Primary

Methyl > Tertiary > Secondary

Tertiary > Secondary > Primary

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

E1cB

SN1

SN2

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

Concerted elimination

Radical chain reaction

One-step with inversion

Two-step with carbocation intermediate

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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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