Chemistry Alkyl Halides Online Mcqs Test

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Question 1

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

Question 2

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

Answer

Backside attack

Answer

One-step reaction

Answer

Rearrangement

Question 3

3. The stability of carbocations follows the order:

Answer

Primary > Secondary > Tertiary

Answer

Tertiary > Secondary > Primary

Answer

Methyl > Tertiary > Secondary

Answer

Secondary > Tertiary > Primary

Question 4

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

Answer

Temperature only

Answer

Both nucleophile and alkyl halide

Answer

Concentration of nucleophile only

Answer

Concentration of alkyl halide only

Question 5

5. Which condition favors elimination over substitution?

Answer

Cold temperature

Answer

Nonpolar solvent

Answer

Strong base and heat

Question 6

6. Which statement is true about E1 reactions?

Answer

Carbocation intermediate is formed

Answer

Occurs with strong bases only

Answer

Needs non-polar solvent

Answer

One-step process

Question 7

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

Answer

Radical chain reaction

Answer

Two-step with carbocation intermediate

Answer

One-step with inversion

Answer

Concerted elimination

Question 8

8. Why is fluoride a poor leaving group?

Answer

It forms strong C–F bonds

Answer

It is neutral

Answer

It is unstable

Answer

It is too reactive

Question 9

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

Answer

Ethyl bromide

Answer

Isopropyl iodide

Answer

Tert-butyl bromide

Answer

Methyl chloride

Question 10

10. Which base is typically used in E2 reactions?

Question 11

11. Which condition favors SN2 over SN1?

Answer

Weak nucleophile

Answer

Tertiary alkyl halide

Answer

Polar protic solvent

Answer

Strong nucleophile and primary alkyl halide

Question 12

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

Question 13

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

Answer

Front side

Question 14

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

Answer

1-bromobutane

Answer

2-bromo-2-methylpropane

Answer

Tert-butyl bromide

Answer

2-bromobutane

Question 15

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

Answer

Polar protic

Answer

Polar aprotic

Question 16

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

Answer

Butanoic acid

Question 17

17. In an E2 reaction, the base removes:

Answer

A methyl group

Answer

A β-hydrogen

Answer

A hydrogen on the same carbon

Answer

The halogen

Question 18

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

Answer

Tert-butyl bromide

Answer

Methyl chloride

Answer

Isopropyl iodide

Answer

Ethyl bromide

Question 19

19. What is the general formula for alkyl halides?

Question 20

20. In an E2 reaction, the base removes:

Answer

A methyl group

Answer

The halogen

Answer

A hydrogen on the same carbon

Answer

A β-hydrogen

Question 21

21. What is the general formula for alkyl halides?

Question 22

22. Which condition favors SN2 over SN1?

Answer

Weak nucleophile

Answer

Tertiary alkyl halide

Answer

Strong nucleophile and primary alkyl halide

Answer

Polar protic solvent

Question 23

23. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 24

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

Answer

Butanoic acid

Question 25

25. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Methyl chloride

Answer

Isopropyl chloride

Answer

Ethyl chloride

Answer

Tert-butyl chloride

Question 26

26. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Isopropyl chloride

Answer

Tert-butyl chloride

Answer

Ethyl chloride

Answer

Methyl chloride

Question 27

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

Answer

Acid hydrolysis

Question 28

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

Answer

Methyl chloride

Answer

1-bromobutane

Answer

2-chloro-2-methylpropane

Answer

2-bromobutane

Question 29

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

Question 30

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

Answer

Alkyl group

Answer

Nucleophile

Answer

Halogen atom

Question 31

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

Answer

Pentanoic acid

Answer

2-pentanol

Question 32

32. Which of the following favors E2 over E1?

Answer

Strong base and heat

Answer

Polar protic solvent

Answer

Low temperature

Question 33

33. Which factor increases the rate of SN1 reactions?

Answer

Polar protic solvent

Answer

Polar aprotic solvent

Answer

Strong nucleophile

Question 34

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

Question 35

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

Answer

Methyl chloride

Answer

Primary chloride

Answer

Tertiary bromide

Answer

Secondary fluoride

Question 36

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

Answer

(CH₃)₃CCl

Answer

CH₃CHClCH₃

Answer

CH₃CH₂Cl

Question 37

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

Answer

2-chloropropane

Answer

1-chloropropane

Answer

Isopropyl chloride

Answer

Propyl chloride

Question 38

38. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 39

39. The stability of carbocations follows the order:

Answer

Secondary > Tertiary > Primary

Answer

Methyl > Tertiary > Secondary

Answer

Tertiary > Secondary > Primary

Answer

Primary > Secondary > Tertiary

Question 40

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

Answer

Tetrahedral

Answer

Trigonal planar

Answer

Trigonal bipyramidal

Question 41

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

Answer

Front side

Question 42

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

Answer

Tetrahedral

Answer

Trigonal bipyramidal

Answer

Trigonal planar

Question 43

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

Question 44

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

Answer

Propyl chloride

Answer

1-chloropropane

Answer

2-chloropropane

Answer

Isopropyl chloride

Question 45

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

Answer

The least substituted product is formed

Answer

The most stable carbocation forms first

Answer

The halide leaves first

Answer

The more substituted alkene is the major product

Question 46

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

Answer

Rearranged

Question 47

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

Answer

Radical chain reaction

Answer

One-step with inversion

Answer

Two-step with carbocation intermediate

Answer

Concerted elimination

Question 48

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

Answer

Pentanoic acid

Answer

2-pentanol

Question 49

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

Answer

Acid hydrolysis

Question 50

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

Question 51

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

Answer

1-bromobutane

Answer

2-bromo-2-methylpropane

Answer

Tert-butyl bromide

Answer

2-bromobutane

Question 52

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

Answer

Rearranged

Question 53

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

Question 54

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

Answer

Secondary fluoride

Answer

Primary chloride

Answer

Tertiary bromide

Answer

Methyl chloride

Question 55

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

Question 56

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

Answer

Polar aprotic

Answer

Polar protic

Question 57

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

Answer

Alkyl group

Answer

Halogen atom

Answer

Nucleophile

Question 58

58. Which factor increases the rate of SN1 reactions?

Answer

Polar protic solvent

Answer

Strong nucleophile

Answer

Polar aprotic solvent

Question 59

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

Question 60

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

Answer

2-chloro-2-methylpropane

Answer

Methyl chloride

Answer

2-bromobutane

Answer

1-bromobutane

Question 61

61. Which is a characteristic of SN2 mechanism?

Answer

First-order kinetics

Answer

Carbocation intermediate

Answer

Inversion of configuration

Answer

Rearrangement possible

Question 62

62. Which is a characteristic of SN2 mechanism?

Answer

Carbocation intermediate

Answer

First-order kinetics

Answer

Inversion of configuration

Answer

Rearrangement possible

Question 63

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

Answer

The more substituted alkene is the major product

Answer

The least substituted product is formed

Answer

The halide leaves first

Answer

The most stable carbocation forms first

Question 64

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

Answer 157

Cold temperature

Answer 158

Strong base and heat

Answer 159

Nonpolar solvent

Answer 160

Low temperature

Answer 161

Strong base and heat

Answer 162

Polar protic solvent

Answer 163

One-step reaction

Answer 164

Rearrangement

Answer 165

Backside attack

Answer 166

It is unstable

Answer 167

It is too reactive

Answer 168

It is neutral

Answer 169

It forms strong C–F bonds

Answer 170

CH₃CH₂Cl

Answer 171

(CH₃)₃CCl

Answer 172

CH₃CHClCH₃

Answer 173

Butanoic acid

Answer 174

Butanoic acid

Answer 175

Concentration of alkyl halide only

Answer 176

Concentration of nucleophile only

Answer 177

Both nucleophile and alkyl halide

Answer 178

Temperature only

Answer 179

Tert-butyl bromide

Answer 180

Ethyl bromide

Answer 181

Isopropyl chloride

Answer 182

Methyl iodide

Answer 183

Occurs with strong bases only

Answer 184

Needs non-polar solvent

Answer 185

Carbocation intermediate is formed

Answer 186

One-step process

Answer 187

Methyl iodide

Answer 188

Tert-butyl bromide

Answer 189

Isopropyl chloride

Answer 190

Ethyl bromide

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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