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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

2-chloropropane

Propyl chloride

1-chloropropane

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

Butene

Butanoic acid

1-butanol

2-butanol

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

Inversion

One-step reaction

Rearrangement

Backside attack

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

Butanol

Butanoic acid

Butane

Butene

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

The more substituted alkene is the major product

The most stable carbocation forms first

The least substituted product is formed

The halide leaves first

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

Racemized

Retained

Rearranged

Inverted

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

–Br

–CH₃

–OH

–NH₂

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

Pentanoic acid

2-pentanol

2-pentene

Pentane

9. Which alkyl halide undergoes SN2 reaction most readily?

Methyl chloride

Ethyl chloride

Isopropyl chloride

Tert-butyl chloride

10. Which factor increases the rate of SN1 reactions?

Polar protic solvent

Strong nucleophile

Polar aprotic solvent

Weak base

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

Concentration of alkyl halide only

Temperature only

Both nucleophile and alkyl halide

Concentration of nucleophile only

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

Chlorine

Fluorine

Bromine

Iodine

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

Primary chloride

Secondary fluoride

Tertiary bromide

Methyl chloride

14. In an E2 reaction, the base removes:

The halogen

A methyl group

A hydrogen on the same carbon

A β-hydrogen

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

SN1

SN2

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

Methyl iodide

Isopropyl chloride

Ethyl bromide

Tert-butyl bromide

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

SN2

Addition

SN1

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

SN2

Acid hydrolysis

SN1

19. Which alkyl halide undergoes SN2 reaction most readily?

Methyl chloride

Isopropyl chloride

Ethyl chloride

Tert-butyl chloride

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

2-chloro-2-methylpropane

Methyl chloride

2-bromobutane

1-bromobutane

21. What is the general formula for alkyl halides?

CnH2nBr

CnHXn

CnH2n+1X

CnH2n+2

22. Which of the following favors E2 over E1?

Low temperature

Polar protic solvent

Strong base and heat

Weak base

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

SN1

SN2

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

Fluorine

Chlorine

Iodine

Bromine

25. Which condition favors SN2 over SN1?

Tertiary alkyl halide

Weak nucleophile

Polar protic solvent

Strong nucleophile and primary alkyl halide

Page 2 of 4

26. 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

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

Propyl chloride

1-chloropropane

Isopropyl chloride

2-chloropropane

28. Which of the following favors E2 over E1?

Polar protic solvent

Weak base

Low temperature

Strong base and heat

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

2-pentanol

Pentane

2-pentene

Pentanoic acid

30. Why is fluoride a poor leaving group?

It forms strong C–F bonds

It is unstable

It is neutral

It is too reactive

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

Butanoic acid

Butene

Butanol

Butane

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

Secondary

Methyl

Tertiary

Primary

33. Which statement is true about E1 reactions?

Carbocation intermediate is formed

Occurs with strong bases only

Needs non-polar solvent

One-step process

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

2-bromobutane

Tert-butyl bromide

1-bromobutane

2-bromo-2-methylpropane

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

One-step reaction

Inversion

Backside attack

Rearrangement

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

–OH

–CH₃

–Br

–NH₂

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

Tert-butyl bromide

Ethyl bromide

Methyl chloride

Isopropyl iodide

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

Halogen atom

Carbon

Nucleophile

Alkyl group

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

SN2

SN1

40. Which statement is true about E1 reactions?

Occurs with strong bases only

One-step process

Needs non-polar solvent

Carbocation intermediate is formed

41. Which of the following solvents favors SN2 reactions?

Ethanol

Acetic acid

Water

Acetone

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

SN1

SN2

Addition

43. Which condition favors SN2 over SN1?

Weak nucleophile

Strong nucleophile and primary alkyl halide

Polar protic solvent

Tertiary alkyl halide

44. Which is a characteristic of SN2 mechanism?

Rearrangement possible

First-order kinetics

Carbocation intermediate

Inversion of configuration

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

Below

Back side

Front side

Above

46. Which of the following solvents favors SN2 reactions?

Water

Acetic acid

Acetone

Ethanol

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

2-bromobutane

Methyl chloride

2-chloro-2-methylpropane

1-bromobutane

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

E1cB

SN1

SN2

49. Which is a characteristic of SN2 mechanism?

Inversion of configuration

Rearrangement possible

First-order kinetics

Carbocation intermediate

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

Polar aprotic

Acidic

Non-polar

Polar protic

Page 3 of 4

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

Retained

Racemized

Inverted

Rearranged

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

Concerted elimination

Two-step with carbocation intermediate

One-step with inversion

Radical chain reaction

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

SN2

SN1

54. The stability of carbocations follows the order:

Secondary > Tertiary > Primary

Methyl > Tertiary > Secondary

Tertiary > Secondary > Primary

Primary > Secondary > Tertiary

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

SN2

Acid hydrolysis

SN1

56. Which condition favors elimination over substitution?

Weak base

Strong base and heat

Nonpolar solvent

Cold temperature

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

Trigonal bipyramidal

Linear

Tetrahedral

Trigonal planar

58. What is the general formula for alkyl halides?

CnHXn

CnH2n+2

CnH2nBr

CnH2n+1X

59. Why is fluoride a poor leaving group?

It is neutral

It is too reactive

It forms strong C–F bonds

It is unstable

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

Polar aprotic

Acidic

Polar protic

Non-polar

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

Methyl iodide

Ethyl bromide

Isopropyl chloride

Tert-butyl bromide

62. Which condition favors elimination over substitution?

Weak base

Cold temperature

Strong base and heat

Nonpolar solvent

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

Primary

Tertiary

Methyl

Secondary

64. In an E2 reaction, the base removes:

The halogen

A methyl group

A hydrogen on the same carbon

A β-hydrogen

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

Two

Three

None

One

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

Butanoic acid

2-butanol

1-butanol

Butene

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

SN2

SN1

E1cB

68. The stability of carbocations follows the order:

Tertiary > Secondary > Primary

Secondary > Tertiary > Primary

Primary > Secondary > Tertiary

Methyl > Tertiary > Secondary

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

2-bromobutane

Tert-butyl bromide

1-bromobutane

2-bromo-2-methylpropane

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

The halide leaves first

The least substituted product is formed

The most stable carbocation forms first

The more substituted alkene is the major product

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

Tetrahedral

Trigonal bipyramidal

Linear

Trigonal planar

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

Tertiary bromide

Secondary fluoride

Methyl chloride

Primary chloride

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

CH₃CH₂Cl

CH₃Cl

CH₃CHClCH₃

(CH₃)₃CCl

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

One-step with inversion

Concerted elimination

Radical chain reaction

Two-step with carbocation intermediate

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

Front side

Below

Above

Back side

Page 4 of 4

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

Two

Three

One

None

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

sp²d

sp²

sp³

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

Methyl chloride

Tert-butyl bromide

Ethyl bromide

Isopropyl iodide

79. Which base is typically used in E2 reactions?

H₂O

NaOH

CH₃OH

NH₃

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

sp³

sp²

sp²d

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

Alkyl group

Halogen atom

Carbon

Nucleophile

82. Which base is typically used in E2 reactions?

H₂O

NH₃

CH₃OH

NaOH

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

CH₃CHClCH₃

CH₃Cl

CH₃CH₂Cl

(CH₃)₃CCl

84. Which factor increases the rate of SN1 reactions?

Polar aprotic solvent

Strong nucleophile

Weak base

Polar protic solvent

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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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Mustansar Khan

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