Chemistry Alkyl Halides Online Mcqs Test

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Question 1

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

Answer

2-bromobutane

Answer

2-bromo-2-methylpropane

Answer

1-bromobutane

Answer

Tert-butyl bromide

Question 2

2. The stability of carbocations follows the order:

Answer

Secondary > Tertiary > Primary

Answer

Tertiary > Secondary > Primary

Answer

Primary > Secondary > Tertiary

Answer

Methyl > Tertiary > Secondary

Question 3

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

Answer

Methyl iodide

Answer

Ethyl bromide

Answer

Isopropyl chloride

Answer

Tert-butyl bromide

Question 4

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

Answer

Front side

Question 5

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

Answer

1-chloropropane

Answer

Propyl chloride

Answer

2-chloropropane

Answer

Isopropyl chloride

Question 6

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

Question 7

7. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 8

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

Answer

Butanoic acid

Question 9

9. Which condition favors SN2 over SN1?

Answer

Strong nucleophile and primary alkyl halide

Answer

Polar protic solvent

Answer

Tertiary alkyl halide

Answer

Weak nucleophile

Question 10

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

Answer

Polar aprotic

Answer

Polar protic

Question 11

11. Which of the following favors E2 over E1?

Answer

Low temperature

Answer

Polar protic solvent

Answer

Strong base and heat

Question 12

12. Which is a characteristic of SN2 mechanism?

Answer

Rearrangement possible

Answer

Inversion of configuration

Answer

Carbocation intermediate

Answer

First-order kinetics

Question 13

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

Question 14

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

Answer

Methyl chloride

Answer

2-bromobutane

Answer

1-bromobutane

Answer

2-chloro-2-methylpropane

Question 15

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

Answer

Isopropyl chloride

Answer

1-chloropropane

Answer

Propyl chloride

Answer

2-chloropropane

Question 16

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

Answer

CH₃CH₂Cl

Answer

(CH₃)₃CCl

Answer

CH₃CHClCH₃

Question 17

17. Which base is typically used in E2 reactions?

Question 18

18. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Tert-butyl chloride

Answer

Isopropyl chloride

Answer

Methyl chloride

Answer

Ethyl chloride

Question 19

19. Which condition favors elimination over substitution?

Answer

Strong base and heat

Answer

Cold temperature

Answer

Nonpolar solvent

Question 20

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

Answer

Alkyl group

Answer

Halogen atom

Answer

Nucleophile

Question 21

21. Which factor increases the rate of SN1 reactions?

Answer

Polar aprotic solvent

Answer

Polar protic solvent

Answer

Strong nucleophile

Question 22

22. In an E2 reaction, the base removes:

Answer

A methyl group

Answer

A hydrogen on the same carbon

Answer

The halogen

Answer

A β-hydrogen

Question 23

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

Answer

Trigonal planar

Answer

Tetrahedral

Answer

Trigonal bipyramidal

Question 24

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

Answer

Ethyl bromide

Answer

Tert-butyl bromide

Answer

Isopropyl iodide

Answer

Methyl chloride

Question 25

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

Answer

Butanoic acid

Question 26

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

Answer

The more substituted alkene is the major product

Answer

The halide leaves first

Answer

The least substituted product is formed

Answer

The most stable carbocation forms first

Question 27

27. What is the general formula for alkyl halides?

Question 28

28. 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 29

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

Question 30

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

Answer

Tertiary bromide

Answer

Primary chloride

Answer

Secondary fluoride

Answer

Methyl chloride

Question 31

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

Answer

Rearranged

Question 32

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

Question 33

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

Answer

Butanoic acid

Question 34

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

Question 35

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

Answer

The more substituted alkene is the major product

Answer

The most stable carbocation forms first

Answer

The least substituted product is formed

Answer

The halide leaves first

Question 36

36. What is the general formula for alkyl halides?

Question 37

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

Question 38

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

Answer

Concentration of alkyl halide only

Answer

Concentration of nucleophile only

Answer

Both nucleophile and alkyl halide

Answer

Temperature only

Question 39

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

Answer

Trigonal bipyramidal

Answer

Tetrahedral

Answer

Trigonal planar

Question 40

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

Answer

One-step with inversion

Answer

Two-step with carbocation intermediate

Answer

Concerted elimination

Answer

Radical chain reaction

Question 41

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

Answer

Butanoic acid

Question 42

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

Answer

Polar protic

Answer

Polar aprotic

Question 43

43. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 44

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

Answer

Front side

Question 45

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

Answer

One-step reaction

Answer

Rearrangement

Answer

Backside attack

Question 46

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

Question 47

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

Question 48

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

Answer

Rearranged

Question 49

49. 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 50

50. Which condition favors elimination over substitution?

Answer

Nonpolar solvent

Answer

Cold temperature

Answer

Strong base and heat

Question 51

51. 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 52

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

Question 53

53. Which statement is true about E1 reactions?

Answer

Occurs with strong bases only

Answer

Needs non-polar solvent

Answer

One-step process

Answer

Carbocation intermediate is formed

Question 54

54. Which base is typically used in E2 reactions?

Question 55

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

Question 56

56. Which of the following favors E2 over E1?

Answer

Strong base and heat

Answer

Polar protic solvent

Answer

Low temperature

Question 57

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

Question 58

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

Answer

Acid hydrolysis

Question 59

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

Answer

Backside attack

Answer

One-step reaction

Answer

Rearrangement

Question 60

60. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Tert-butyl chloride

Answer

Isopropyl chloride

Answer

Ethyl chloride

Answer

Methyl chloride

Question 61

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

Answer

Ethyl bromide

Answer

Methyl chloride

Answer

Isopropyl iodide

Answer

Tert-butyl bromide

Question 62

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

Question 63

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

Answer

Acid hydrolysis

Question 64

64. The stability of carbocations follows the order:

Answer

Methyl > Tertiary > Secondary

Answer

Tertiary > Secondary > Primary

Answer

Primary > Secondary > Tertiary

Answer

Secondary > Tertiary > Primary

Answer 142

Nucleophile

Answer 143

Alkyl group

Answer 144

Halogen atom

Answer 145

Inversion of configuration

Answer 146

First-order kinetics

Answer 147

Carbocation intermediate

Answer 148

Rearrangement possible

Answer 149

Methyl chloride

Answer 150

Primary chloride

Answer 151

Secondary fluoride

Answer 152

Tertiary bromide

Answer 153

2-pentanol

Answer 154

Pentanoic acid

Answer 155

(CH₃)₃CCl

Answer 156

CH₃CH₂Cl

Answer 157

CH₃CHClCH₃

Answer 158

Tert-butyl bromide

Answer 159

1-bromobutane

Answer 160

2-bromo-2-methylpropane

Answer 161

2-bromobutane

Answer 162

Strong nucleophile

Answer 163

Polar aprotic solvent

Answer 164

Polar protic solvent

Answer 165

2-pentanol

Answer 166

Pentanoic acid

Answer 167

Weak nucleophile

Answer 168

Polar protic solvent

Answer 169

Strong nucleophile and primary alkyl halide

Answer 170

Tertiary alkyl halide

Answer 171

Occurs with strong bases only

Answer 172

Carbocation intermediate is formed

Answer 173

One-step process

Answer 174

Needs non-polar solvent

Answer 175

It forms strong C–F bonds

Answer 176

It is neutral

Answer 177

It is unstable

Answer 178

It is too reactive

Answer 179

2-bromobutane

Answer 180

1-bromobutane

Answer 181

Methyl chloride

Answer 182

2-chloro-2-methylpropane

Answer 183

Ethyl bromide

Answer 184

Methyl iodide

Answer 185

Tert-butyl bromide

Answer 186

Isopropyl chloride

Answer 187

It forms strong C–F bonds

Answer 188

It is too reactive

Answer 189

It is neutral

Answer 190

It is unstable

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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