Chemistry Alkyl Halides Online Mcqs Test

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Question 1

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

Question 2

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

Answer

Polar protic

Answer

Polar aprotic

Question 3

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

Answer

2-pentanol

Answer

Pentanoic acid

Question 4

4. Which condition favors elimination over substitution?

Answer

Nonpolar solvent

Answer

Strong base and heat

Answer

Cold temperature

Question 5

5. In an E2 reaction, the base removes:

Answer

A hydrogen on the same carbon

Answer

A methyl group

Answer

The halogen

Answer

A β-hydrogen

Question 6

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

Question 7

7. 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 8

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

Question 9

9. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Ethyl chloride

Answer

Isopropyl chloride

Answer

Methyl chloride

Answer

Tert-butyl chloride

Question 10

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

Answer

CH₃CHClCH₃

Answer

CH₃CH₂Cl

Answer

(CH₃)₃CCl

Question 11

11. Which condition favors elimination over substitution?

Answer

Strong base and heat

Answer

Nonpolar solvent

Answer

Cold temperature

Question 12

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

Answer

Acid hydrolysis

Question 13

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

Question 14

14. Which factor increases the rate of SN1 reactions?

Answer

Strong nucleophile

Answer

Polar protic solvent

Answer

Polar aprotic solvent

Question 15

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

Question 16

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

Answer

Rearrangement

Answer

Backside attack

Answer

One-step reaction

Question 17

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

Question 18

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

Answer

(CH₃)₃CCl

Answer

CH₃CH₂Cl

Answer

CH₃CHClCH₃

Question 19

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

Answer

Isopropyl chloride

Answer

Tert-butyl bromide

Answer

Ethyl bromide

Answer

Methyl iodide

Question 20

20. In an E2 reaction, the base removes:

Answer

A hydrogen on the same carbon

Answer

A β-hydrogen

Answer

A methyl group

Answer

The halogen

Question 21

21. 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 22

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

Answer

Tert-butyl bromide

Answer

Ethyl bromide

Answer

Isopropyl chloride

Answer

Methyl iodide

Question 23

23. Which base is typically used in E2 reactions?

Question 24

24. Why is fluoride a poor leaving group?

Answer

It is too reactive

Answer

It forms strong C–F bonds

Answer

It is unstable

Answer

It is neutral

Question 25

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

Answer

Butanoic acid

Question 26

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

Answer

Polar protic

Answer

Polar aprotic

Question 27

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

Answer

Methyl chloride

Answer

Isopropyl iodide

Answer

Tert-butyl bromide

Answer

Ethyl bromide

Question 28

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

Answer

2-bromobutane

Answer

1-bromobutane

Answer

Tert-butyl bromide

Answer

2-bromo-2-methylpropane

Question 29

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

Question 30

30. 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 31

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

Question 32

32. Which factor increases the rate of SN1 reactions?

Answer

Strong nucleophile

Answer

Polar protic solvent

Answer

Polar aprotic solvent

Question 33

33. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 34

34. Which is a characteristic of SN2 mechanism?

Answer

Carbocation intermediate

Answer

First-order kinetics

Answer

Rearrangement possible

Answer

Inversion of configuration

Question 35

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

Answer

Front side

Question 36

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

Answer

Butanoic acid

Question 37

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

Answer

Concentration of alkyl halide only

Answer

Temperature only

Answer

Concentration of nucleophile only

Answer

Both nucleophile and alkyl halide

Question 38

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

Question 39

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

Answer

Tetrahedral

Answer

Trigonal bipyramidal

Answer

Trigonal planar

Question 40

40. Which is a characteristic of SN2 mechanism?

Answer

First-order kinetics

Answer

Inversion of configuration

Answer

Rearrangement possible

Answer

Carbocation intermediate

Question 41

41. Which base is typically used in E2 reactions?

Question 42

42. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Tert-butyl chloride

Answer

Ethyl chloride

Answer

Methyl chloride

Answer

Isopropyl chloride

Question 43

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

Question 44

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

Question 45

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

Answer

Rearranged

Question 46

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

Question 47

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

Answer

Tert-butyl bromide

Answer

Isopropyl iodide

Answer

Methyl chloride

Answer

Ethyl bromide

Question 48

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

Answer

Isopropyl chloride

Answer

Propyl chloride

Answer

1-chloropropane

Answer

2-chloropropane

Question 49

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

Answer

Halogen atom

Answer

Alkyl group

Answer

Nucleophile

Question 50

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

Question 51

51. What is the general formula for alkyl halides?

Question 52

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

Question 53

53. 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 54

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

Answer

2-bromobutane

Answer

1-bromobutane

Answer

2-chloro-2-methylpropane

Answer

Methyl chloride

Question 55

55. Which condition favors SN2 over SN1?

Answer

Weak nucleophile

Answer

Polar protic solvent

Answer

Tertiary alkyl halide

Answer

Strong nucleophile and primary alkyl halide

Question 56

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

Answer

Methyl chloride

Answer

Secondary fluoride

Answer

Tertiary bromide

Answer

Primary chloride

Question 57

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

Question 58

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

Question 59

59. Why is fluoride a poor leaving group?

Answer

It forms strong C–F bonds

Answer

It is too reactive

Answer

It is unstable

Answer

It is neutral

Question 60

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

Answer

Trigonal planar

Answer

Tetrahedral

Answer

Trigonal bipyramidal

Question 61

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

Question 62

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

Answer

Butanoic acid

Question 63

63. What is the general formula for alkyl halides?

Question 64

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

Answer

Concentration of alkyl halide only

Answer

Temperature only

Answer

Concentration of nucleophile only

Answer

Both nucleophile and alkyl halide

Answer 136

2-pentanol

Answer 137

Pentanoic acid

Answer 138

Tertiary > Secondary > Primary

Answer 139

Methyl > Tertiary > Secondary

Answer 140

Secondary > Tertiary > Primary

Answer 141

Primary > Secondary > Tertiary

Answer 142

Front side

Answer 143

The more substituted alkene is the major product

Answer 144

The halide leaves first

Answer 145

The most stable carbocation forms first

Answer 146

The least substituted product is formed

Answer 147

Rearranged

Answer 148

Occurs with strong bases only

Answer 149

Needs non-polar solvent

Answer 150

Carbocation intermediate is formed

Answer 151

One-step process

Answer 152

Acid hydrolysis

Answer 153

2-chloropropane

Answer 154

Isopropyl chloride

Answer 155

1-chloropropane

Answer 156

Propyl chloride

Answer 157

Primary chloride

Answer 158

Methyl chloride

Answer 159

Secondary fluoride

Answer 160

Tertiary bromide

Answer 161

Strong base and heat

Answer 162

Low temperature

Answer 163

Polar protic solvent

Answer 164

Strong base and heat

Answer 165

Polar protic solvent

Answer 166

Low temperature

Answer 167

Butanoic acid

Answer 168

Concerted elimination

Answer 169

Two-step with carbocation intermediate

Answer 170

Radical chain reaction

Answer 171

One-step with inversion

Answer 172

Acetic acid

Answer 173

The halide leaves first

Answer 174

The most stable carbocation forms first

Answer 175

The least substituted product is formed

Answer 176

The more substituted alkene is the major product

Answer 177

Weak nucleophile

Answer 178

Polar protic solvent

Answer 179

Tertiary alkyl halide

Answer 180

Strong nucleophile and primary alkyl halide

Answer 181

Halogen atom

Answer 182

Alkyl group

Answer 183

Nucleophile

Answer 184

Backside attack

Answer 185

One-step reaction

Answer 186

Rearrangement

Answer 187

Methyl > Tertiary > Secondary

Answer 188

Primary > Secondary > Tertiary

Answer 189

Secondary > Tertiary > Primary

Answer 190

Tertiary > Secondary > Primary

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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