Chemistry Alkyl Halides Online Mcqs Test

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Question 1

1. In an E2 reaction, the base removes:

Answer

A hydrogen on the same carbon

Answer

A β-hydrogen

Answer

The halogen

Answer

A methyl group

Question 2

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

Question 3

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

Question 4

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

Question 5

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

Answer

(CH₃)₃CCl

Answer

CH₃CHClCH₃

Answer

CH₃CH₂Cl

Question 6

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

Answer

2-pentanol

Answer

Pentanoic acid

Question 7

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

Answer

Acid hydrolysis

Question 8

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

Answer

Tetrahedral

Answer

Trigonal planar

Answer

Trigonal bipyramidal

Question 9

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

Answer

Radical chain reaction

Answer

One-step with inversion

Answer

Two-step with carbocation intermediate

Answer

Concerted elimination

Question 10

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

Answer

Polar protic

Answer

Polar aprotic

Question 11

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

Answer

Butanoic acid

Question 12

12. Which is a characteristic of SN2 mechanism?

Answer

Inversion of configuration

Answer

Rearrangement possible

Answer

First-order kinetics

Answer

Carbocation intermediate

Question 13

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

Answer

Butanoic acid

Question 14

14. Which statement is true about E1 reactions?

Answer

Carbocation intermediate is formed

Answer

One-step process

Answer

Needs non-polar solvent

Answer

Occurs with strong bases only

Question 15

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

Question 16

16. 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 17

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

Answer

Backside attack

Answer

Rearrangement

Answer

One-step reaction

Question 18

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

Answer

Nucleophile

Answer

Alkyl group

Answer

Halogen atom

Question 19

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

Question 20

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

Answer

One-step reaction

Answer

Backside attack

Answer

Rearrangement

Question 21

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

Answer

The most stable carbocation forms first

Answer

The more substituted alkene is the major product

Answer

The halide leaves first

Answer

The least substituted product is formed

Question 22

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

Answer

Rearranged

Question 23

23. Which condition favors SN2 over SN1?

Answer

Weak nucleophile

Answer

Tertiary alkyl halide

Answer

Strong nucleophile and primary alkyl halide

Answer

Polar protic solvent

Question 24

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

Question 25

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

Answer

Butanoic acid

Question 26

26. Which factor increases the rate of SN1 reactions?

Answer

Polar aprotic solvent

Answer

Polar protic solvent

Answer

Strong nucleophile

Question 27

27. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Isopropyl chloride

Answer

Tert-butyl chloride

Answer

Ethyl chloride

Answer

Methyl chloride

Question 28

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

Answer

2-bromo-2-methylpropane

Answer

1-bromobutane

Answer

2-bromobutane

Answer

Tert-butyl bromide

Question 29

29. Which condition favors elimination over substitution?

Answer

Strong base and heat

Answer

Nonpolar solvent

Answer

Cold temperature

Question 30

30. Why is fluoride a poor leaving group?

Answer

It is unstable

Answer

It is neutral

Answer

It forms strong C–F bonds

Answer

It is too reactive

Question 31

31. The stability of carbocations follows the order:

Answer

Tertiary > Secondary > Primary

Answer

Primary > Secondary > Tertiary

Answer

Secondary > Tertiary > Primary

Answer

Methyl > Tertiary > Secondary

Question 32

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

Question 33

33. What is the general formula for alkyl halides?

Question 34

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

Answer

Isopropyl chloride

Answer

Tert-butyl bromide

Answer

Methyl iodide

Answer

Ethyl bromide

Question 35

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

Answer

Isopropyl chloride

Answer

Methyl iodide

Answer

Ethyl bromide

Answer

Tert-butyl bromide

Question 36

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

Question 37

37. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 38

38. 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 39

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

Question 40

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

Question 41

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

Answer

Isopropyl iodide

Answer

Ethyl bromide

Answer

Tert-butyl bromide

Answer

Methyl chloride

Question 42

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

Answer

Butanoic acid

Question 43

43. Which base is typically used in E2 reactions?

Question 44

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

Answer

The more substituted alkene is the major product

Answer

The halide leaves first

Answer

The most stable carbocation forms first

Answer

The least substituted product is formed

Question 45

45. Which of the following favors E2 over E1?

Answer

Polar protic solvent

Answer

Low temperature

Answer

Strong base and heat

Question 46

46. Which is a characteristic of SN2 mechanism?

Answer

Inversion of configuration

Answer

Rearrangement possible

Answer

First-order kinetics

Answer

Carbocation intermediate

Question 47

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

Answer

2-chloro-2-methylpropane

Answer

1-bromobutane

Answer

Methyl chloride

Answer

2-bromobutane

Question 48

48. What is the general formula for alkyl halides?

Question 49

49. Which condition favors elimination over substitution?

Answer

Strong base and heat

Answer

Cold temperature

Answer

Nonpolar solvent

Question 50

50. 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 51

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

Answer

1-chloropropane

Answer

2-chloropropane

Answer

Propyl chloride

Answer

Isopropyl chloride

Question 52

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

Answer

Temperature only

Answer

Concentration of alkyl halide only

Answer

Both nucleophile and alkyl halide

Answer

Concentration of nucleophile only

Question 53

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

Question 54

54. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 55

55. Which statement is true about E1 reactions?

Answer

Carbocation intermediate is formed

Answer

Needs non-polar solvent

Answer

One-step process

Answer

Occurs with strong bases only

Question 56

56. 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 57

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

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

Question 61

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

Answer

Both nucleophile and alkyl halide

Answer

Concentration of alkyl halide only

Answer

Temperature only

Answer

Concentration of nucleophile only

Question 62

62. Which base is typically used in E2 reactions?

Question 63

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

Answer

2-chloropropane

Answer

Propyl chloride

Answer

1-chloropropane

Answer

Isopropyl chloride

Question 64

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

Answer

Front side

Answer 145

Concerted elimination

Answer 146

Radical chain reaction

Answer 147

Two-step with carbocation intermediate

Answer 148

One-step with inversion

Answer 149

CH₃CHClCH₃

Answer 150

(CH₃)₃CCl

Answer 151

CH₃CH₂Cl

Answer 152

Pentanoic acid

Answer 153

2-pentanol

Answer 154

Acid hydrolysis

Answer 155

Tertiary > Secondary > Primary

Answer 156

Secondary > Tertiary > Primary

Answer 157

Primary > Secondary > Tertiary

Answer 158

Methyl > Tertiary > Secondary

Answer 159

1-bromobutane

Answer 160

Tert-butyl bromide

Answer 161

2-bromobutane

Answer 162

2-bromo-2-methylpropane

Answer 163

Methyl chloride

Answer 164

Isopropyl chloride

Answer 165

Tert-butyl chloride

Answer 166

Ethyl chloride

Answer 167

Nucleophile

Answer 168

Alkyl group

Answer 169

Halogen atom

Answer 170

Tertiary bromide

Answer 171

Methyl chloride

Answer 172

Secondary fluoride

Answer 173

Primary chloride

Answer 174

A hydrogen on the same carbon

Answer 175

A β-hydrogen

Answer 176

A methyl group

Answer 177

The halogen

Answer 178

Front side

Answer 179

Weak nucleophile

Answer 180

Tertiary alkyl halide

Answer 181

Strong nucleophile and primary alkyl halide

Answer 182

Polar protic solvent

Answer 183

Tetrahedral

Answer 184

Trigonal bipyramidal

Answer 185

Trigonal planar

Answer 186

Strong nucleophile

Answer 187

Polar protic solvent

Answer 188

Polar aprotic solvent

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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