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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 halogen is the most reactive in alkyl halides?

Iodine

Bromine

Fluorine

Chlorine

2. Why is fluoride a poor leaving group?

It is too reactive

It forms strong C–F bonds

It is neutral

It is unstable

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

Pentane

2-pentene

Pentanoic acid

2-pentanol

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

Rearrangement

Inversion

One-step reaction

Backside attack

5. In an E2 reaction, the base removes:

A β-hydrogen

The halogen

A hydrogen on the same carbon

A methyl group

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

2-pentanol

Pentane

Pentanoic acid

2-pentene

7. Which factor increases the rate of SN1 reactions?

Polar aprotic solvent

Weak base

Polar protic solvent

Strong nucleophile

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

Secondary

Tertiary

Primary

Methyl

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

SN1

SN2

Acid hydrolysis

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

(CH₃)₃CCl

CH₃CHClCH₃

CH₃Cl

CH₃CH₂Cl

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

Methyl chloride

Tertiary bromide

Primary chloride

Secondary fluoride

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

Iodine

Fluorine

Bromine

Chlorine

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

Methyl chloride

Primary chloride

Tertiary bromide

Secondary fluoride

14. Which factor increases the rate of SN1 reactions?

Weak base

Strong nucleophile

Polar protic solvent

Polar aprotic solvent

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

Linear

Trigonal bipyramidal

Tetrahedral

Trigonal planar

16. Which of the following favors E2 over E1?

Weak base

Strong base and heat

Polar protic solvent

Low temperature

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

Back side

Above

Below

Front side

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

Isopropyl chloride

Tert-butyl bromide

Methyl iodide

Ethyl bromide

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

SN2

SN1

E1cB

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

CH₃Cl

(CH₃)₃CCl

CH₃CHClCH₃

CH₃CH₂Cl

21. Which statement is true about E1 reactions?

Carbocation intermediate is formed

One-step process

Needs non-polar solvent

Occurs with strong bases only

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

The most stable carbocation forms first

The halide leaves first

The more substituted alkene is the major product

The least substituted product is formed

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

None

Two

Three

One

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

Trigonal planar

Tetrahedral

Trigonal bipyramidal

Linear

25. Which base is typically used in E2 reactions?

NH₃

NaOH

CH₃OH

H₂O

Page 2 of 4

26. What is the general formula for alkyl halides?

CnH2nBr

CnH2n+1X

CnH2n+2

CnHXn

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

Methyl chloride

Ethyl bromide

Tert-butyl bromide

Isopropyl iodide

28. Which base is typically used in E2 reactions?

NH₃

NaOH

H₂O

CH₃OH

29. 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

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

2-chloro-2-methylpropane

2-bromobutane

Methyl chloride

1-bromobutane

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

2-chloropropane

Propyl chloride

1-chloropropane

Isopropyl chloride

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

SN1

SN2

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

sp³

sp²

sp²d

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

2-bromo-2-methylpropane

2-bromobutane

Tert-butyl bromide

1-bromobutane

35. Which of the following favors E2 over E1?

Weak base

Low temperature

Strong base and heat

Polar protic solvent

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

Ethyl bromide

Methyl chloride

Isopropyl iodide

Tert-butyl bromide

37. Which is a characteristic of SN2 mechanism?

Inversion of configuration

Rearrangement possible

First-order kinetics

Carbocation intermediate

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

2-butanol

1-butanol

Butanoic acid

Butene

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

SN1

SN2

Addition

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

None

One

Two

Three

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

SN1

SN2

42. In an E2 reaction, the base removes:

A β-hydrogen

A methyl group

A hydrogen on the same carbon

The halogen

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

2-bromo-2-methylpropane

2-bromobutane

Tert-butyl bromide

1-bromobutane

44. The stability of carbocations follows the order:

Secondary > Tertiary > Primary

Methyl > Tertiary > Secondary

Primary > Secondary > Tertiary

Tertiary > Secondary > Primary

45. Which condition favors elimination over substitution?

Weak base

Cold temperature

Strong base and heat

Nonpolar solvent

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

sp²d

sp³

sp²

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

Non-polar

Polar aprotic

Polar protic

Acidic

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

SN2

SN1

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

2-chloropropane

1-chloropropane

Propyl chloride

Isopropyl chloride

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

Inversion

Rearrangement

One-step reaction

Backside attack

Page 3 of 4

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

SN1

SN2

52. The stability of carbocations follows the order:

Secondary > Tertiary > Primary

Primary > Secondary > Tertiary

Methyl > Tertiary > Secondary

Tertiary > Secondary > Primary

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

Methyl iodide

Ethyl bromide

Isopropyl chloride

Tert-butyl bromide

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

Butene

Butanol

Butanoic acid

Butane

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

SN2

Addition

SN1

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

Concerted elimination

Two-step with carbocation intermediate

Radical chain reaction

One-step with inversion

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

SN2

SN1

Acid hydrolysis

58. Which condition favors SN2 over SN1?

Weak nucleophile

Strong nucleophile and primary alkyl halide

Tertiary alkyl halide

Polar protic solvent

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

Carbon

Alkyl group

Nucleophile

Halogen atom

60. Which condition favors elimination over substitution?

Weak base

Strong base and heat

Cold temperature

Nonpolar solvent

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

1-bromobutane

2-bromobutane

2-chloro-2-methylpropane

Methyl chloride

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

–OH

–CH₃

–NH₂

–Br

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

Carbon

Halogen atom

Nucleophile

Alkyl group

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

Below

Above

Back side

Front side

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

Radical chain reaction

Concerted elimination

Two-step with carbocation intermediate

One-step with inversion

66. Which alkyl halide undergoes SN2 reaction most readily?

Ethyl chloride

Methyl chloride

Isopropyl chloride

Tert-butyl chloride

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

Concentration of nucleophile only

Concentration of alkyl halide only

Both nucleophile and alkyl halide

Temperature only

68. Which condition favors SN2 over SN1?

Polar protic solvent

Tertiary alkyl halide

Weak nucleophile

Strong nucleophile and primary alkyl halide

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

SN2

SN1

E1cB

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

Polar protic

Non-polar

Acidic

Polar aprotic

71. Which alkyl halide undergoes SN2 reaction most readily?

Methyl chloride

Tert-butyl chloride

Isopropyl chloride

Ethyl chloride

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

Butene

Butane

Butanoic acid

Butanol

73. Which is a characteristic of SN2 mechanism?

Carbocation intermediate

Inversion of configuration

Rearrangement possible

First-order kinetics

74. Why is fluoride a poor leaving group?

It is too reactive

It is unstable

It forms strong C–F bonds

It is neutral

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

The least substituted product is formed

The most stable carbocation forms first

The halide leaves first

The more substituted alkene is the major product

Page 4 of 4

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

–OH

–NH₂

–Br

–CH₃

77. Which statement is true about E1 reactions?

Occurs with strong bases only

Needs non-polar solvent

Carbocation intermediate is formed

One-step process

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

Racemized

Retained

Rearranged

Inverted

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

Rearranged

Retained

Racemized

Inverted

80. Which of the following solvents favors SN2 reactions?

Acetic acid

Water

Ethanol

Acetone

81. What is the general formula for alkyl halides?

CnHXn

CnH2n+1X

CnH2nBr

CnH2n+2

82. Which of the following solvents favors SN2 reactions?

Ethanol

Acetic acid

Acetone

Water

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

Methyl

Secondary

Primary

Tertiary

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

1-butanol

2-butanol

Butene

Butanoic acid

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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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