Chemistry Alkyl Halides Online Mcqs Test

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Question 1

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

Answer

Backside attack

Answer

Rearrangement

Answer

One-step reaction

Question 2

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

Answer

Secondary fluoride

Answer

Primary chloride

Answer

Methyl chloride

Answer

Tertiary bromide

Question 3

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

Answer

Nucleophile

Answer

Alkyl group

Answer

Halogen atom

Question 4

4. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 5

5. In an E2 reaction, the base removes:

Answer

The halogen

Answer

A methyl group

Answer

A hydrogen on the same carbon

Answer

A β-hydrogen

Question 6

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

Answer

Rearranged

Question 7

7. Which statement is true about E1 reactions?

Answer

Needs non-polar solvent

Answer

One-step process

Answer

Occurs with strong bases only

Answer

Carbocation intermediate is formed

Question 8

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

Answer

(CH₃)₃CCl

Answer

CH₃CH₂Cl

Answer

CH₃CHClCH₃

Question 9

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

Question 10

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

Answer

One-step reaction

Answer

Rearrangement

Answer

Backside attack

Question 11

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

Answer

Tert-butyl bromide

Answer

2-bromobutane

Answer

1-bromobutane

Answer

2-bromo-2-methylpropane

Question 12

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

Answer

The most stable carbocation forms first

Answer

The more substituted alkene is the major product

Answer

The least substituted product is formed

Answer

The halide leaves first

Question 13

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

Answer

Tert-butyl bromide

Answer

Isopropyl chloride

Answer

Methyl iodide

Answer

Ethyl bromide

Question 14

14. Which factor increases the rate of SN1 reactions?

Answer

Strong nucleophile

Answer

Polar aprotic solvent

Answer

Polar protic solvent

Question 15

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

Answer

Pentanoic acid

Answer

2-pentanol

Question 16

16. The stability of carbocations follows the order:

Answer

Methyl > Tertiary > Secondary

Answer

Primary > Secondary > Tertiary

Answer

Secondary > Tertiary > Primary

Answer

Tertiary > Secondary > Primary

Question 17

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

Answer

CH₃CH₂Cl

Answer

(CH₃)₃CCl

Answer

CH₃CHClCH₃

Question 18

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

Question 19

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

Answer

Butanoic acid

Question 20

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

Answer

Rearranged

Question 21

21. Why is fluoride a poor leaving group?

Answer

It is unstable

Answer

It is neutral

Answer

It is too reactive

Answer

It forms strong C–F bonds

Question 22

22. In an E2 reaction, the base removes:

Answer

A β-hydrogen

Answer

A methyl group

Answer

The halogen

Answer

A hydrogen on the same carbon

Question 23

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

Answer

The most stable carbocation forms first

Answer

The halide leaves first

Answer

The least substituted product is formed

Answer

The more substituted alkene is the major product

Question 24

24. Which of the following favors E2 over E1?

Answer

Polar protic solvent

Answer

Strong base and heat

Answer

Low temperature

Question 25

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

Answer

Acid hydrolysis

Question 26

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

Answer

2-bromo-2-methylpropane

Answer

Tert-butyl bromide

Answer

1-bromobutane

Answer

2-bromobutane

Question 27

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

Answer

Primary chloride

Answer

Tertiary bromide

Answer

Methyl chloride

Answer

Secondary fluoride

Question 28

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

Answer

Front side

Question 29

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

Question 30

30. Which statement is true about E1 reactions?

Answer

Occurs with strong bases only

Answer

Carbocation intermediate is formed

Answer

Needs non-polar solvent

Answer

One-step process

Question 31

31. Which condition favors elimination over substitution?

Answer

Cold temperature

Answer

Nonpolar solvent

Answer

Strong base and heat

Question 32

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

Question 33

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

Question 34

34. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Isopropyl chloride

Answer

Methyl chloride

Answer

Ethyl chloride

Answer

Tert-butyl chloride

Question 35

35. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Ethyl chloride

Answer

Tert-butyl chloride

Answer

Isopropyl chloride

Answer

Methyl chloride

Question 36

36. Which factor increases the rate of SN1 reactions?

Answer

Polar protic solvent

Answer

Polar aprotic solvent

Answer

Strong nucleophile

Question 37

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

Answer

Trigonal planar

Answer

Tetrahedral

Answer

Trigonal bipyramidal

Question 38

38. What is the general formula for alkyl halides?

Question 39

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

Answer

2-chloro-2-methylpropane

Answer

2-bromobutane

Answer

1-bromobutane

Answer

Methyl chloride

Question 40

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

Answer

1-bromobutane

Answer

Methyl chloride

Answer

2-chloro-2-methylpropane

Answer

2-bromobutane

Question 41

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

Answer

Ethyl bromide

Answer

Tert-butyl bromide

Answer

Methyl iodide

Answer

Isopropyl chloride

Question 42

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

Question 43

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

Question 44

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

Answer

Tetrahedral

Answer

Trigonal planar

Answer

Trigonal bipyramidal

Question 45

45. The stability of carbocations follows the order:

Answer

Primary > Secondary > Tertiary

Answer

Secondary > Tertiary > Primary

Answer

Tertiary > Secondary > Primary

Answer

Methyl > Tertiary > Secondary

Question 46

46. What is the general formula for alkyl halides?

Question 47

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

Question 48

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

Answer

Butanoic acid

Question 49

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

Answer

Concentration of nucleophile only

Answer

Both nucleophile and alkyl halide

Answer

Temperature only

Answer

Concentration of alkyl halide only

Question 50

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

Question 51

51. Which is a characteristic of SN2 mechanism?

Answer

Inversion of configuration

Answer

Carbocation intermediate

Answer

Rearrangement possible

Answer

First-order kinetics

Question 52

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

Answer

Polar protic

Answer

Polar aprotic

Question 53

53. Which is a characteristic of SN2 mechanism?

Answer

Carbocation intermediate

Answer

First-order kinetics

Answer

Rearrangement possible

Answer

Inversion of configuration

Question 54

54. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 55

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

Answer

2-pentanol

Answer

Pentanoic acid

Question 56

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

Answer

Propyl chloride

Answer

2-chloropropane

Answer

1-chloropropane

Answer

Isopropyl chloride

Question 57

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

Question 58

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

Question 59

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

Question 60

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

Question 61

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

Answer

Concerted elimination

Answer

Radical chain reaction

Answer

One-step with inversion

Answer

Two-step with carbocation intermediate

Question 62

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

Question 63

63. Which base is typically used in E2 reactions?

Question 64

64. Which base is typically used in E2 reactions?

Answer 144

It is unstable

Answer 145

It is too reactive

Answer 146

It forms strong C–F bonds

Answer 147

It is neutral

Answer 148

Concentration of alkyl halide only

Answer 149

Temperature only

Answer 150

Both nucleophile and alkyl halide

Answer 151

Concentration of nucleophile only

Answer 152

Tert-butyl bromide

Answer 153

Isopropyl iodide

Answer 154

Methyl chloride

Answer 155

Ethyl bromide

Answer 156

Polar protic

Answer 157

Polar aprotic

Answer 158

Cold temperature

Answer 159

Nonpolar solvent

Answer 160

Strong base and heat

Answer 161

Acid hydrolysis

Answer 162

Tertiary alkyl halide

Answer 163

Strong nucleophile and primary alkyl halide

Answer 164

Weak nucleophile

Answer 165

Polar protic solvent

Answer 166

Butanoic acid

Answer 167

2-chloropropane

Answer 168

1-chloropropane

Answer 169

Propyl chloride

Answer 170

Isopropyl chloride

Answer 171

Butanoic acid

Answer 172

Polar protic solvent

Answer 173

Low temperature

Answer 174

Strong base and heat

Answer 175

Front side

Answer 176

Tert-butyl bromide

Answer 177

Methyl chloride

Answer 178

Ethyl bromide

Answer 179

Isopropyl iodide

Answer 180

Halogen atom

Answer 181

Alkyl group

Answer 182

Nucleophile

Answer 183

Weak nucleophile

Answer 184

Polar protic solvent

Answer 185

Tertiary alkyl halide

Answer 186

Strong nucleophile and primary alkyl halide

Answer 187

Concerted elimination

Answer 188

Radical chain reaction

Answer 189

One-step with inversion

Answer 190

Two-step with carbocation intermediate

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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