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

Trigonal planar

Trigonal bipyramidal

Linear

Tetrahedral

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

SN1

SN2

Acid hydrolysis

3. Which is a characteristic of SN2 mechanism?

Carbocation intermediate

Rearrangement possible

Inversion of configuration

First-order kinetics

4. In an E2 reaction, the base removes:

The halogen

A methyl group

A β-hydrogen

A hydrogen on the same carbon

5. Which factor increases the rate of SN1 reactions?

Polar protic solvent

Strong nucleophile

Polar aprotic solvent

Weak base

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

One-step with inversion

Two-step with carbocation intermediate

Radical chain reaction

Concerted elimination

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

Concentration of nucleophile only

Temperature only

Concentration of alkyl halide only

Both nucleophile and alkyl halide

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

Trigonal bipyramidal

Trigonal planar

Linear

Tetrahedral

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

SN2

SN1

10. Which base is typically used in E2 reactions?

NaOH

CH₃OH

NH₃

H₂O

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

Isopropyl chloride

Tert-butyl bromide

Ethyl bromide

Methyl iodide

12. Which of the following favors E2 over E1?

Low temperature

Strong base and heat

Weak base

Polar protic solvent

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

Secondary fluoride

Methyl chloride

Primary chloride

Tertiary bromide

14. Which alkyl halide undergoes SN2 reaction most readily?

Tert-butyl chloride

Methyl chloride

Ethyl chloride

Isopropyl chloride

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

SN1

SN2

Acid hydrolysis

16. Which base is typically used in E2 reactions?

H₂O

CH₃OH

NaOH

NH₃

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

SN1

E1cB

SN2

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

Bromine

Fluorine

Chlorine

Iodine

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

SN2

SN1

20. Which of the following solvents favors SN2 reactions?

Ethanol

Water

Acetic acid

Acetone

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

Butanoic acid

Butanol

Butane

Butene

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

Carbon

Alkyl group

Halogen atom

Nucleophile

23. Which statement is true about E1 reactions?

Carbocation intermediate is formed

Needs non-polar solvent

One-step process

Occurs with strong bases only

24. Why is fluoride a poor leaving group?

It is too reactive

It is neutral

It is unstable

It forms strong C–F bonds

25. Which is a characteristic of SN2 mechanism?

Carbocation intermediate

Inversion of configuration

First-order kinetics

Rearrangement possible

Page 2 of 4

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

Backside attack

One-step reaction

Inversion

Rearrangement

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

Tert-butyl bromide

Methyl iodide

Isopropyl chloride

Ethyl bromide

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

Nucleophile

Carbon

Halogen atom

Alkyl group

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

–CH₃

–NH₂

–OH

–Br

30. Which of the following solvents favors SN2 reactions?

Water

Acetic acid

Acetone

Ethanol

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

Butene

Butanoic acid

2-butanol

1-butanol

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

SN1

E1cB

SN2

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

CH₃Cl

CH₃CHClCH₃

CH₃CH₂Cl

(CH₃)₃CCl

34. Why is fluoride a poor leaving group?

It is too reactive

It is unstable

It forms strong C–F bonds

It is neutral

35. Which condition favors elimination over substitution?

Weak base

Strong base and heat

Nonpolar solvent

Cold temperature

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

Back side

Front side

Below

Above

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

The least substituted product is formed

The most stable carbocation forms first

The more substituted alkene is the major product

The halide leaves first

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

2-bromobutane

Tert-butyl bromide

2-bromo-2-methylpropane

1-bromobutane

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

–Br

–OH

–CH₃

–NH₂

40. Which condition favors SN2 over SN1?

Polar protic solvent

Tertiary alkyl halide

Weak nucleophile

Strong nucleophile and primary alkyl halide

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

Propyl chloride

Isopropyl chloride

2-chloropropane

1-chloropropane

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

Inversion

One-step reaction

Rearrangement

Backside attack

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

Isopropyl iodide

Tert-butyl bromide

Ethyl bromide

Methyl chloride

44. Which condition favors SN2 over SN1?

Strong nucleophile and primary alkyl halide

Polar protic solvent

Weak nucleophile

Tertiary alkyl halide

45. Which statement is true about E1 reactions?

Carbocation intermediate is formed

Occurs with strong bases only

One-step process

Needs non-polar solvent

46. Which condition favors elimination over substitution?

Cold temperature

Nonpolar solvent

Strong base and heat

Weak base

47. What is the general formula for alkyl halides?

CnH2nBr

CnHXn

CnH2n+2

CnH2n+1X

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

Tert-butyl bromide

Isopropyl iodide

Methyl chloride

Ethyl bromide

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

Tert-butyl bromide

1-bromobutane

2-bromo-2-methylpropane

2-bromobutane

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

Pentanoic acid

Pentane

2-pentanol

2-pentene

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 of the following describes Zaitsev's Rule?

The least substituted product is formed

The more substituted alkene is the major product

The most stable carbocation forms first

The halide leaves first

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

Front side

Back side

Above

Below

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

SN1

SN2

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

Tertiary bromide

Primary chloride

Secondary fluoride

Methyl chloride

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

SN1

Addition

SN2

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

Retained

Inverted

Racemized

Rearranged

58. Which alkyl halide undergoes SN2 reaction most readily?

Tert-butyl chloride

Isopropyl chloride

Methyl chloride

Ethyl chloride

59. Which of the following favors E2 over E1?

Low temperature

Weak base

Strong base and heat

Polar protic solvent

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

SN1

SN2

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

sp³

sp²

sp²d

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

Rearranged

Racemized

Retained

Inverted

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

Pentanoic acid

Pentane

2-pentanol

2-pentene

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

Polar protic

Polar aprotic

Acidic

Non-polar

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

1-butanol

Butanoic acid

Butene

2-butanol

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

Two

One

Three

None

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

Two

None

Three

One

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

Primary

Secondary

Tertiary

Methyl

69. The stability of carbocations follows the order:

Methyl > Tertiary > Secondary

Tertiary > Secondary > Primary

Primary > Secondary > Tertiary

Secondary > Tertiary > Primary

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

Concerted elimination

One-step with inversion

Two-step with carbocation intermediate

Radical chain reaction

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

2-chloro-2-methylpropane

1-bromobutane

Methyl chloride

2-bromobutane

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

1-chloropropane

Isopropyl chloride

2-chloropropane

Propyl chloride

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

CH₃Cl

CH₃CH₂Cl

(CH₃)₃CCl

CH₃CHClCH₃

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

Concentration of nucleophile only

Temperature only

Concentration of alkyl halide only

Both nucleophile and alkyl halide

75. What is the general formula for alkyl halides?

CnH2n+2

CnH2nBr

CnHXn

CnH2n+1X

Page 4 of 4

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

Non-polar

Acidic

Polar protic

Polar aprotic

77. The stability of carbocations follows the order:

Tertiary > Secondary > Primary

Methyl > Tertiary > Secondary

Secondary > Tertiary > Primary

Primary > Secondary > Tertiary

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

Chlorine

Iodine

Fluorine

Bromine

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

Butane

Butanoic acid

Butene

Butanol

80. Which factor increases the rate of SN1 reactions?

Polar aprotic solvent

Strong nucleophile

Polar protic solvent

Weak base

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

sp³

sp²d

sp²

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

SN1

SN2

Addition

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

Primary

Tertiary

Methyl

Secondary

84. In an E2 reaction, the base removes:

A hydrogen on the same carbon

A methyl group

The halogen

A β-hydrogen

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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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