Chemistry Alkyl Halides Online Mcqs Test

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Question 1

1. 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 2

2. 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 most stable carbocation forms first

Answer

The halide leaves first

Question 3

3. Which factor increases the rate of SN1 reactions?

Answer

Strong nucleophile

Answer

Polar aprotic solvent

Answer

Polar protic solvent

Question 4

4. What is the general formula for alkyl halides?

Question 5

5. Which factor increases the rate of SN1 reactions?

Answer

Polar aprotic solvent

Answer

Strong nucleophile

Answer

Polar protic solvent

Question 6

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

Answer

2-pentanol

Answer

Pentanoic acid

Question 7

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

Answer

Alkyl group

Answer

Nucleophile

Answer

Halogen atom

Question 8

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

Question 9

9. Which of the following favors E2 over E1?

Answer

Low temperature

Answer

Polar protic solvent

Answer

Strong base and heat

Question 10

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

Answer

2-pentanol

Answer

Pentanoic acid

Question 11

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

Answer

Acid hydrolysis

Question 12

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

Answer

CH₃CH₂Cl

Answer

(CH₃)₃CCl

Answer

CH₃CHClCH₃

Question 13

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

Answer

Polar protic

Answer

Polar aprotic

Question 14

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

Answer

2-bromobutane

Answer

Methyl chloride

Answer

1-bromobutane

Answer

2-chloro-2-methylpropane

Question 15

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

Question 16

16. Why is fluoride a poor leaving group?

Answer

It is neutral

Answer

It forms strong C–F bonds

Answer

It is unstable

Answer

It is too reactive

Question 17

17. Which is a characteristic of SN2 mechanism?

Answer

Inversion of configuration

Answer

Rearrangement possible

Answer

First-order kinetics

Answer

Carbocation intermediate

Question 18

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

Answer

Front side

Question 19

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

Answer

1-bromobutane

Answer

2-bromo-2-methylpropane

Answer

2-bromobutane

Answer

Tert-butyl bromide

Question 20

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

Answer

One-step reaction

Answer

Backside attack

Answer

Rearrangement

Question 21

21. Which base is typically used in E2 reactions?

Question 22

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

Answer

Tetrahedral

Answer

Trigonal bipyramidal

Answer

Trigonal planar

Question 23

23. Which statement is true about E1 reactions?

Answer

One-step process

Answer

Carbocation intermediate is formed

Answer

Needs non-polar solvent

Answer

Occurs with strong bases only

Question 24

24. The stability of carbocations follows the order:

Answer

Tertiary > Secondary > Primary

Answer

Methyl > Tertiary > Secondary

Answer

Secondary > Tertiary > Primary

Answer

Primary > Secondary > Tertiary

Question 25

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

Answer

Butanoic acid

Question 26

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

Answer

Butanoic acid

Question 27

27. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Tert-butyl chloride

Answer

Methyl chloride

Answer

Isopropyl chloride

Answer

Ethyl chloride

Question 28

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

Answer

Trigonal bipyramidal

Answer

Trigonal planar

Answer

Tetrahedral

Question 29

29. In an E2 reaction, the base removes:

Answer

A β-hydrogen

Answer

A hydrogen on the same carbon

Answer

A methyl group

Answer

The halogen

Question 30

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

Answer

Butanoic acid

Question 31

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

Answer

2-chloropropane

Answer

Propyl chloride

Answer

1-chloropropane

Answer

Isopropyl chloride

Question 32

32. 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 33

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

Answer

Polar protic

Answer

Polar aprotic

Question 34

34. Which is a characteristic of SN2 mechanism?

Answer

Rearrangement possible

Answer

Carbocation intermediate

Answer

First-order kinetics

Answer

Inversion of configuration

Question 35

35. Why is fluoride a poor leaving group?

Answer

It forms strong C–F bonds

Answer

It is neutral

Answer

It is too reactive

Answer

It is unstable

Question 36

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

Answer

Front side

Question 37

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

Question 38

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

Answer

CH₃CH₂Cl

Answer

(CH₃)₃CCl

Answer

CH₃CHClCH₃

Question 39

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

Question 40

40. The stability of carbocations follows the order:

Answer

Primary > Secondary > Tertiary

Answer

Tertiary > Secondary > Primary

Answer

Methyl > Tertiary > Secondary

Answer

Secondary > Tertiary > Primary

Question 41

41. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 42

42. Which base is typically used in E2 reactions?

Question 43

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

Answer

Tert-butyl bromide

Answer

Ethyl bromide

Answer

Isopropyl chloride

Answer

Methyl iodide

Question 44

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

Question 45

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

Question 46

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

Question 47

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

Question 48

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

Answer

Rearranged

Question 49

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

Answer

One-step reaction

Answer

Backside attack

Answer

Rearrangement

Question 50

50. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 51

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

Answer

Ethyl bromide

Answer

Tert-butyl bromide

Answer

Methyl chloride

Answer

Isopropyl iodide

Question 52

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

Answer

Isopropyl iodide

Answer

Ethyl bromide

Answer

Tert-butyl bromide

Answer

Methyl chloride

Question 53

53. 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 54

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

Answer

Both nucleophile and alkyl halide

Answer

Concentration of alkyl halide only

Answer

Concentration of nucleophile only

Answer

Temperature only

Question 55

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

Question 56

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

Answer

2-chloro-2-methylpropane

Answer

Methyl chloride

Answer

1-bromobutane

Answer

2-bromobutane

Question 57

57. Which condition favors SN2 over SN1?

Answer

Tertiary alkyl halide

Answer

Weak nucleophile

Answer

Polar protic solvent

Answer

Strong nucleophile and primary alkyl halide

Question 58

58. Which statement is true about E1 reactions?

Answer

Needs non-polar solvent

Answer

Occurs with strong bases only

Answer

Carbocation intermediate is formed

Answer

One-step process

Question 59

59. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Tert-butyl chloride

Answer

Isopropyl chloride

Answer

Ethyl chloride

Answer

Methyl chloride

Question 60

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

Question 61

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

Answer

Methyl iodide

Answer

Ethyl bromide

Answer

Isopropyl chloride

Answer

Tert-butyl bromide

Question 62

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

Answer

Primary chloride

Answer

Secondary fluoride

Answer

Methyl chloride

Answer

Tertiary bromide

Question 63

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

Answer

1-chloropropane

Answer

Isopropyl chloride

Answer

Propyl chloride

Answer

2-chloropropane

Question 64

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

Answer

Acid hydrolysis

Answer 157

Rearranged

Answer 158

2-bromo-2-methylpropane

Answer 159

1-bromobutane

Answer 160

2-bromobutane

Answer 161

Tert-butyl bromide

Answer 162

Nonpolar solvent

Answer 163

Strong base and heat

Answer 164

Cold temperature

Answer 165

Alkyl group

Answer 166

Nucleophile

Answer 167

Halogen atom

Answer 168

Two-step with carbocation intermediate

Answer 169

One-step with inversion

Answer 170

Concerted elimination

Answer 171

Radical chain reaction

Answer 172

Methyl chloride

Answer 173

Secondary fluoride

Answer 174

Tertiary bromide

Answer 175

Primary chloride

Answer 176

Nonpolar solvent

Answer 177

Strong base and heat

Answer 178

Cold temperature

Answer 179

The halogen

Answer 180

A β-hydrogen

Answer 181

A methyl group

Answer 182

A hydrogen on the same carbon

Answer 183

Polar protic solvent

Answer 184

Strong base and heat

Answer 185

Low temperature

Answer 186

Two-step with carbocation intermediate

Answer 187

One-step with inversion

Answer 188

Concerted elimination

Answer 189

Radical chain reaction

Answer 190

Butanoic acid

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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