Chemistry Alkyl Halides Online Mcqs Test

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Question 1

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

Answer

Butanoic acid

Question 2

2. The stability of carbocations follows the order:

Answer

Primary > Secondary > Tertiary

Answer

Secondary > Tertiary > Primary

Answer

Methyl > Tertiary > Secondary

Answer

Tertiary > Secondary > Primary

Question 3

3. Why is fluoride a poor leaving group?

Answer

It is neutral

Answer

It is too reactive

Answer

It forms strong C–F bonds

Answer

It is unstable

Question 4

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

Answer

2-chloro-2-methylpropane

Answer

Methyl chloride

Answer

2-bromobutane

Answer

1-bromobutane

Question 5

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

Answer

Rearranged

Question 6

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

Answer

Tert-butyl bromide

Answer

Ethyl bromide

Answer

Methyl chloride

Answer

Isopropyl iodide

Question 7

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

Answer

2-pentanol

Answer

Pentanoic acid

Question 8

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

Answer

Tert-butyl bromide

Answer

Methyl iodide

Answer

Isopropyl chloride

Answer

Ethyl bromide

Question 9

9. What is the general formula for alkyl halides?

Question 10

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

Answer

Methyl iodide

Answer

Isopropyl chloride

Answer

Tert-butyl bromide

Answer

Ethyl bromide

Question 11

11. 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 12

12. Which statement is true about E1 reactions?

Answer

Occurs with strong bases only

Answer

One-step process

Answer

Needs non-polar solvent

Answer

Carbocation intermediate is formed

Question 13

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

Answer

Butanoic acid

Question 14

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

Question 15

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

Answer

2-pentanol

Answer

Pentanoic acid

Question 18

18. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 19

19. Which base is typically used in E2 reactions?

Question 20

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

Question 21

21. Which condition favors SN2 over SN1?

Answer

Polar protic solvent

Answer

Tertiary alkyl halide

Answer

Weak nucleophile

Answer

Strong nucleophile and primary alkyl halide

Question 22

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

Question 23

23. 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 24

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

Answer

Front side

Question 25

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

Question 26

26. 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 27

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

Question 28

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

Answer

Trigonal planar

Answer

Trigonal bipyramidal

Answer

Tetrahedral

Question 29

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

Answer

1-chloropropane

Answer

Propyl chloride

Answer

Isopropyl chloride

Answer

2-chloropropane

Question 30

30. Which factor increases the rate of SN1 reactions?

Answer

Polar aprotic solvent

Answer

Strong nucleophile

Answer

Polar protic solvent

Question 31

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

Question 32

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

Question 33

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

Question 34

34. Which condition favors elimination over substitution?

Answer

Nonpolar solvent

Answer

Cold temperature

Answer

Strong base and heat

Question 35

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

Answer

One-step reaction

Answer

Backside attack

Answer

Rearrangement

Question 36

36. What is the general formula for alkyl halides?

Question 37

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

Question 38

38. 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 39

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

Answer

Halogen atom

Answer

Alkyl group

Answer

Nucleophile

Question 40

40. 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 41

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

Question 42

42. 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 43

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

Question 44

44. Which is a characteristic of SN2 mechanism?

Answer

First-order kinetics

Answer

Rearrangement possible

Answer

Inversion of configuration

Answer

Carbocation intermediate

Question 45

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

Question 46

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

Answer

(CH₃)₃CCl

Answer

CH₃CH₂Cl

Answer

CH₃CHClCH₃

Question 47

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

Question 48

48. Which base is typically used in E2 reactions?

Question 49

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

Question 50

50. 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 51

51. 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 52

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

Question 53

53. Why is fluoride a poor leaving group?

Answer

It forms strong C–F bonds

Answer

It is unstable

Answer

It is neutral

Answer

It is too reactive

Question 54

54. Which factor increases the rate of SN1 reactions?

Answer

Polar aprotic solvent

Answer

Polar protic solvent

Answer

Strong nucleophile

Question 55

55. Which of the following favors E2 over E1?

Answer

Strong base and heat

Answer

Polar protic solvent

Answer

Low temperature

Question 56

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

Answer

Polar protic

Answer

Polar aprotic

Question 57

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

Answer

Front side

Question 58

58. 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 59

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

Answer

Nucleophile

Answer

Halogen atom

Answer

Alkyl group

Question 60

60. 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 halide leaves first

Answer

The most stable carbocation forms first

Question 61

61. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Tert-butyl chloride

Answer

Ethyl chloride

Answer

Isopropyl chloride

Answer

Methyl chloride

Question 62

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

Answer

Temperature only

Answer

Concentration of nucleophile only

Answer

Both nucleophile and alkyl halide

Answer

Concentration of alkyl halide only

Question 63

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

Answer

Methyl chloride

Answer

Ethyl bromide

Answer

Tert-butyl bromide

Answer

Isopropyl iodide

Question 64

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

Answer

CH₃CH₂Cl

Answer

(CH₃)₃CCl

Answer

CH₃CHClCH₃

Answer 146

Rearranged

Answer 147

The halogen

Answer 148

A hydrogen on the same carbon

Answer 149

A β-hydrogen

Answer 150

A methyl group

Answer 151

Cold temperature

Answer 152

Nonpolar solvent

Answer 153

Strong base and heat

Answer 154

Acid hydrolysis

Answer 155

Secondary > Tertiary > Primary

Answer 156

Primary > Secondary > Tertiary

Answer 157

Methyl > Tertiary > Secondary

Answer 158

Tertiary > Secondary > Primary

Answer 159

Tert-butyl chloride

Answer 160

Isopropyl chloride

Answer 161

Ethyl chloride

Answer 162

Methyl chloride

Answer 163

1-bromobutane

Answer 164

2-bromobutane

Answer 165

Tert-butyl bromide

Answer 166

2-bromo-2-methylpropane

Answer 167

Butanoic acid

Answer 168

Low temperature

Answer 169

Polar protic solvent

Answer 170

Strong base and heat

Answer 171

Tetrahedral

Answer 172

Trigonal planar

Answer 173

Trigonal bipyramidal

Answer 174

Butanoic acid

Answer 175

Polar protic

Answer 176

Polar aprotic

Answer 177

Acetic acid

Answer 178

Acid hydrolysis

Answer 179

Tertiary bromide

Answer 180

Methyl chloride

Answer 181

Primary chloride

Answer 182

Secondary fluoride

Answer 183

Rearrangement possible

Answer 184

Carbocation intermediate

Answer 185

Inversion of configuration

Answer 186

First-order kinetics

Answer 187

1-chloropropane

Answer 188

2-chloropropane

Answer 189

Propyl chloride

Answer 190

Isopropyl chloride

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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