Chemistry Alkyl Halides Online Mcqs Test

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Question 1

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

Question 2

2. What is the general formula for alkyl halides?

Question 3

3. The stability of carbocations follows the order:

Answer

Secondary > Tertiary > Primary

Answer

Methyl > Tertiary > Secondary

Answer

Tertiary > Secondary > Primary

Answer

Primary > Secondary > Tertiary

Question 4

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

Question 5

5. Which is a characteristic of SN2 mechanism?

Answer

Inversion of configuration

Answer

Rearrangement possible

Answer

First-order kinetics

Answer

Carbocation intermediate

Question 6

6. Which factor increases the rate of SN1 reactions?

Answer

Strong nucleophile

Answer

Polar aprotic solvent

Answer

Polar protic solvent

Question 7

7. 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 8

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

Answer

1-bromobutane

Answer

2-bromobutane

Answer

Methyl chloride

Answer

2-chloro-2-methylpropane

Question 9

9. Why is fluoride a poor leaving group?

Answer

It is too reactive

Answer

It is neutral

Answer

It forms strong C–F bonds

Answer

It is unstable

Question 10

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

Question 11

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

Answer

Both nucleophile and alkyl halide

Answer

Temperature only

Answer

Concentration of alkyl halide only

Answer

Concentration of nucleophile only

Question 12

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

Answer

Two-step with carbocation intermediate

Answer

Radical chain reaction

Answer

One-step with inversion

Answer

Concerted elimination

Question 13

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

Answer

Rearrangement

Answer

One-step reaction

Answer

Backside attack

Question 14

14. Which of the following favors E2 over E1?

Answer

Low temperature

Answer

Strong base and heat

Answer

Polar protic solvent

Question 15

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

Question 16

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

Question 17

17. In an E2 reaction, the base removes:

Answer

The halogen

Answer

A hydrogen on the same carbon

Answer

A β-hydrogen

Answer

A methyl group

Question 18

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

Answer

Halogen atom

Answer

Alkyl group

Answer

Nucleophile

Question 19

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

Answer

The halide leaves first

Answer

The most stable carbocation forms first

Answer

The least substituted product is formed

Answer

The more substituted alkene is the major product

Question 20

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

Answer

Methyl chloride

Answer

Isopropyl iodide

Answer

Ethyl bromide

Answer

Tert-butyl bromide

Question 21

21. Which is a characteristic of SN2 mechanism?

Answer

Carbocation intermediate

Answer

Inversion of configuration

Answer

Rearrangement possible

Answer

First-order kinetics

Question 22

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

Question 23

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

Answer

2-pentanol

Answer

Pentanoic acid

Question 24

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

Question 25

25. 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 26

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

Question 27

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

Answer

Acid hydrolysis

Question 28

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

Answer

Butanoic acid

Question 29

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

Answer

Butanoic acid

Question 30

30. 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 31

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

Question 32

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

Question 33

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

Answer

Propyl chloride

Answer

Isopropyl chloride

Answer

1-chloropropane

Answer

2-chloropropane

Question 34

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

Answer

CH₃CHClCH₃

Answer

CH₃CH₂Cl

Answer

(CH₃)₃CCl

Question 35

35. Which base is typically used in E2 reactions?

Question 36

36. Which base is typically used in E2 reactions?

Question 37

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

Answer

Backside attack

Answer

One-step reaction

Answer

Rearrangement

Question 38

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

Question 39

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

Answer

CH₃CHClCH₃

Answer

(CH₃)₃CCl

Answer

CH₃CH₂Cl

Question 40

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

Answer

Methyl iodide

Answer

Tert-butyl bromide

Answer

Isopropyl chloride

Answer

Ethyl bromide

Question 41

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

Answer

2-bromo-2-methylpropane

Answer

2-bromobutane

Answer

1-bromobutane

Answer

Tert-butyl bromide

Question 42

42. Which factor increases the rate of SN1 reactions?

Answer

Polar protic solvent

Answer

Polar aprotic solvent

Answer

Strong nucleophile

Question 43

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

Question 44

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

Answer

2-pentanol

Answer

Pentanoic acid

Question 45

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

Answer

One-step with inversion

Answer

Radical chain reaction

Answer

Concerted elimination

Answer

Two-step with carbocation intermediate

Question 46

46. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 47

47. The stability of carbocations follows the order:

Answer

Primary > Secondary > Tertiary

Answer

Tertiary > Secondary > Primary

Answer

Secondary > Tertiary > Primary

Answer

Methyl > Tertiary > Secondary

Question 48

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

Answer

Acid hydrolysis

Question 49

49. Which statement is true about E1 reactions?

Answer

Carbocation intermediate is formed

Answer

One-step process

Answer

Occurs with strong bases only

Answer

Needs non-polar solvent

Question 50

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

Answer

Ethyl bromide

Answer

Tert-butyl bromide

Answer

Methyl iodide

Answer

Isopropyl chloride

Question 51

51. 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 52

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

Answer

Concentration of alkyl halide only

Answer

Concentration of nucleophile only

Answer

Temperature only

Answer

Both nucleophile and alkyl halide

Question 53

53. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 54

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

Answer

Nucleophile

Answer

Alkyl group

Answer

Halogen atom

Question 55

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

Answer

1-chloropropane

Answer

Propyl chloride

Answer

2-chloropropane

Answer

Isopropyl chloride

Question 56

56. 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 57

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

Answer

Trigonal bipyramidal

Answer

Tetrahedral

Answer

Trigonal planar

Question 58

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

Answer

Rearranged

Question 59

59. Which of the following favors E2 over E1?

Answer

Strong base and heat

Answer

Low temperature

Answer

Polar protic solvent

Question 60

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

Answer

Front side

Question 61

61. Which condition favors elimination over substitution?

Answer

Cold temperature

Answer

Strong base and heat

Answer

Nonpolar solvent

Question 62

62. What is the general formula for alkyl halides?

Question 63

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

Answer

Rearranged

Question 64

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

Answer 146

It forms strong C–F bonds

Answer 147

It is neutral

Answer 148

It is too reactive

Answer 149

It is unstable

Answer 150

Tetrahedral

Answer 151

Trigonal bipyramidal

Answer 152

Trigonal planar

Answer 153

Front side

Answer 154

Secondary fluoride

Answer 155

Primary chloride

Answer 156

Methyl chloride

Answer 157

Tertiary bromide

Answer 158

2-bromobutane

Answer 159

1-bromobutane

Answer 160

2-bromo-2-methylpropane

Answer 161

Tert-butyl bromide

Answer 162

Butanoic acid

Answer 163

Butanoic acid

Answer 164

Polar aprotic

Answer 165

Polar protic

Answer 166

Tert-butyl bromide

Answer 167

Methyl chloride

Answer 168

Ethyl bromide

Answer 169

Isopropyl iodide

Answer 170

Isopropyl chloride

Answer 171

Methyl chloride

Answer 172

Tert-butyl chloride

Answer 173

Ethyl chloride

Answer 174

Isopropyl chloride

Answer 175

Tert-butyl chloride

Answer 176

Methyl chloride

Answer 177

Ethyl chloride

Answer 178

Strong base and heat

Answer 179

Cold temperature

Answer 180

Nonpolar solvent

Answer 181

2-chloro-2-methylpropane

Answer 182

1-bromobutane

Answer 183

2-bromobutane

Answer 184

Methyl chloride

Answer 185

Tertiary alkyl halide

Answer 186

Weak nucleophile

Answer 187

Polar protic solvent

Answer 188

Strong nucleophile and primary alkyl halide

Answer 189

Polar protic

Answer 190

Polar aprotic

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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