Chemistry Alkyl Halides Online Mcqs Test

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Question 1

1. Which is a characteristic of SN2 mechanism?

Answer

Carbocation intermediate

Answer

First-order kinetics

Answer

Rearrangement possible

Answer

Inversion of configuration

Question 2

2. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 3

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

Answer

Rearranged

Question 4

4. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Methyl chloride

Answer

Tert-butyl chloride

Answer

Ethyl chloride

Answer

Isopropyl chloride

Question 5

5. Which factor increases the rate of SN1 reactions?

Answer

Polar protic solvent

Answer

Polar aprotic solvent

Answer

Strong nucleophile

Question 6

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

Question 7

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

Answer

Tert-butyl bromide

Answer

2-bromo-2-methylpropane

Answer

2-bromobutane

Answer

1-bromobutane

Question 8

8. Why is fluoride a poor leaving group?

Answer

It is too reactive

Answer

It is unstable

Answer

It forms strong C–F bonds

Answer

It is neutral

Question 9

9. Which factor increases the rate of SN1 reactions?

Answer

Polar aprotic solvent

Answer

Polar protic solvent

Answer

Strong nucleophile

Question 10

10. In an E2 reaction, the base removes:

Answer

The halogen

Answer

A methyl group

Answer

A β-hydrogen

Answer

A hydrogen on the same carbon

Question 11

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

Answer

CH₃CH₂Cl

Answer

(CH₃)₃CCl

Answer

CH₃CHClCH₃

Question 12

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

Answer

Propyl chloride

Answer

1-chloropropane

Answer

Isopropyl chloride

Answer

2-chloropropane

Question 13

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

Answer

Both nucleophile and alkyl halide

Answer

Concentration of nucleophile only

Answer

Concentration of alkyl halide only

Answer

Temperature only

Question 14

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

Answer

Rearranged

Question 15

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

Question 16

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

Answer

Concentration of alkyl halide only

Answer

Both nucleophile and alkyl halide

Answer

Temperature only

Answer

Concentration of nucleophile only

Question 17

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

Question 18

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

Answer

Nucleophile

Answer

Halogen atom

Answer

Alkyl group

Question 19

19. Which is a characteristic of SN2 mechanism?

Answer

Rearrangement possible

Answer

First-order kinetics

Answer

Carbocation intermediate

Answer

Inversion of configuration

Question 20

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

Answer

Methyl chloride

Answer

1-bromobutane

Answer

2-bromobutane

Answer

2-chloro-2-methylpropane

Question 21

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

Question 22

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

Answer

Methyl iodide

Answer

Tert-butyl bromide

Answer

Isopropyl chloride

Answer

Ethyl bromide

Question 23

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

Question 24

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

Answer

Two-step with carbocation intermediate

Answer

Radical chain reaction

Answer

Concerted elimination

Answer

One-step with inversion

Question 25

25. 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 26

26. The stability of carbocations follows the order:

Answer

Primary > Secondary > Tertiary

Answer

Methyl > Tertiary > Secondary

Answer

Secondary > Tertiary > Primary

Answer

Tertiary > Secondary > Primary

Question 27

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

Question 28

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

Answer

1-chloropropane

Answer

Propyl chloride

Answer

2-chloropropane

Answer

Isopropyl chloride

Question 29

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

Answer

Acid hydrolysis

Question 30

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

Answer

Trigonal bipyramidal

Answer

Tetrahedral

Answer

Trigonal planar

Question 31

31. 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 32

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

Answer

Butanoic acid

Question 33

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

Answer

Front side

Question 34

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

Answer

2-chloro-2-methylpropane

Answer

2-bromobutane

Answer

Methyl chloride

Answer

1-bromobutane

Question 35

35. Which condition favors SN2 over SN1?

Answer

Strong nucleophile and primary alkyl halide

Answer

Tertiary alkyl halide

Answer

Weak nucleophile

Answer

Polar protic solvent

Question 36

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

Answer

Methyl chloride

Answer

Tertiary bromide

Answer

Secondary fluoride

Answer

Primary chloride

Question 37

37. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 38

38. Which of the following favors E2 over E1?

Answer

Polar protic solvent

Answer

Strong base and heat

Answer

Low temperature

Question 39

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

Answer

Polar aprotic

Answer

Polar protic

Question 40

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

Question 41

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

Answer

CH₃CHClCH₃

Answer

(CH₃)₃CCl

Answer

CH₃CH₂Cl

Question 42

42. In an E2 reaction, the base removes:

Answer

A hydrogen on the same carbon

Answer

The halogen

Answer

A β-hydrogen

Answer

A methyl group

Question 43

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

Answer

Secondary fluoride

Answer

Tertiary bromide

Answer

Methyl chloride

Answer

Primary chloride

Question 44

44. What is the general formula for alkyl halides?

Question 45

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

Question 46

46. The stability of carbocations follows the order:

Answer

Secondary > Tertiary > Primary

Answer

Methyl > Tertiary > Secondary

Answer

Tertiary > Secondary > Primary

Answer

Primary > Secondary > Tertiary

Question 47

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

Answer

Butanoic acid

Question 48

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

Question 49

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

Answer

Isopropyl iodide

Answer

Tert-butyl bromide

Answer

Methyl chloride

Answer

Ethyl bromide

Question 50

50. 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 51

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

Question 52

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

Question 53

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

Answer

One-step reaction

Answer

Backside attack

Answer

Rearrangement

Question 54

54. Which of the following favors E2 over E1?

Answer

Low temperature

Answer

Polar protic solvent

Answer

Strong base and heat

Question 55

55. Which condition favors elimination over substitution?

Answer

Strong base and heat

Answer

Nonpolar solvent

Answer

Cold temperature

Question 56

56. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Isopropyl chloride

Answer

Tert-butyl chloride

Answer

Ethyl chloride

Answer

Methyl chloride

Question 57

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

Answer

Alkyl group

Answer

Nucleophile

Answer

Halogen atom

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 of the following halides will undergo SN1 reaction the fastest?

Answer

Isopropyl iodide

Answer

Ethyl bromide

Answer

Methyl chloride

Answer

Tert-butyl bromide

Question 61

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

Answer

Tetrahedral

Answer

Trigonal bipyramidal

Answer

Trigonal planar

Question 62

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

Answer

The least substituted product is formed

Answer

The more substituted alkene is the major product

Answer

The halide leaves first

Answer

The most stable carbocation forms first

Question 63

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

Question 64

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

Answer 155

Strong nucleophile and primary alkyl halide

Answer 156

Tertiary alkyl halide

Answer 157

Polar protic solvent

Answer 158

Weak nucleophile

Answer 159

Butanoic acid

Answer 160

2-pentanol

Answer 161

Pentanoic acid

Answer 162

Butanoic acid

Answer 163

Polar aprotic

Answer 164

Polar protic

Answer 165

Front side

Answer 166

Nonpolar solvent

Answer 167

Cold temperature

Answer 168

Strong base and heat

Answer 169

Pentanoic acid

Answer 170

2-pentanol

Answer 171

Needs non-polar solvent

Answer 172

Carbocation intermediate is formed

Answer 173

Occurs with strong bases only

Answer 174

One-step process

Answer 175

Isopropyl chloride

Answer 176

Methyl iodide

Answer 177

Tert-butyl bromide

Answer 178

Ethyl bromide

Answer 179

One-step reaction

Answer 180

Backside attack

Answer 181

Rearrangement

Answer 182

It is too reactive

Answer 183

It forms strong C–F bonds

Answer 184

It is neutral

Answer 185

It is unstable

Answer 186

Two-step with carbocation intermediate

Answer 187

Concerted elimination

Answer 188

Radical chain reaction

Answer 189

One-step with inversion

Answer 190

Acid hydrolysis

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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