Chemistry Alkyl Halides Online Mcqs Test

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Question 1

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

Answer

2-chloropropane

Answer

Propyl chloride

Answer

Isopropyl chloride

Answer

1-chloropropane

Question 2

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

Question 3

3. What is the general formula for alkyl halides?

Question 4

4. Which is a characteristic of SN2 mechanism?

Answer

Inversion of configuration

Answer

Rearrangement possible

Answer

First-order kinetics

Answer

Carbocation intermediate

Question 5

5. Which factor increases the rate of SN1 reactions?

Answer

Polar protic solvent

Answer

Polar aprotic solvent

Answer

Strong nucleophile

Question 6

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

Question 7

7. Which base is typically used in E2 reactions?

Question 8

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

Answer

Two-step with carbocation intermediate

Answer

Concerted elimination

Answer

Radical chain reaction

Answer

One-step with inversion

Question 9

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

Question 10

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

Answer

Radical chain reaction

Answer

One-step with inversion

Answer

Concerted elimination

Answer

Two-step with carbocation intermediate

Question 11

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

Question 12

12. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 13

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

Answer

Isopropyl chloride

Answer

Ethyl bromide

Answer

Methyl iodide

Answer

Tert-butyl bromide

Question 14

14. Which factor increases the rate of SN1 reactions?

Answer

Polar aprotic solvent

Answer

Polar protic solvent

Answer

Strong nucleophile

Question 15

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

Question 16

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

Question 17

17. What is the general formula for alkyl halides?

Question 18

18. The stability of carbocations follows the order:

Answer

Methyl > Tertiary > Secondary

Answer

Secondary > Tertiary > Primary

Answer

Primary > Secondary > Tertiary

Answer

Tertiary > Secondary > Primary

Question 19

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

Question 20

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

Answer

Butanoic acid

Question 21

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

Answer

Trigonal bipyramidal

Answer

Trigonal planar

Answer

Tetrahedral

Question 22

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

Answer

2-pentanol

Answer

Pentanoic acid

Question 23

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

Answer

Primary chloride

Answer

Secondary fluoride

Answer

Tertiary bromide

Answer

Methyl chloride

Question 24

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

Answer

1-bromobutane

Answer

Methyl chloride

Answer

2-bromobutane

Answer

2-chloro-2-methylpropane

Question 25

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

Question 26

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

Answer

Front side

Question 27

27. Which condition favors elimination over substitution?

Answer

Cold temperature

Answer

Strong base and heat

Answer

Nonpolar solvent

Question 28

28. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Isopropyl chloride

Answer

Tert-butyl chloride

Answer

Methyl chloride

Answer

Ethyl chloride

Question 29

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

Answer

CH₃CHClCH₃

Answer

CH₃CH₂Cl

Answer

(CH₃)₃CCl

Question 30

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

Answer

Halogen atom

Answer

Alkyl group

Answer

Nucleophile

Question 31

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

Question 32

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

Answer

Butanoic acid

Question 33

33. Which condition favors SN2 over SN1?

Answer

Tertiary alkyl halide

Answer

Polar protic solvent

Answer

Weak nucleophile

Answer

Strong nucleophile and primary alkyl halide

Question 34

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

Answer

Rearranged

Question 35

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

Answer

Rearranged

Question 36

36. Which of the following favors E2 over E1?

Answer

Low temperature

Answer

Strong base and heat

Answer

Polar protic solvent

Question 37

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

Answer

Temperature only

Answer

Both nucleophile and alkyl halide

Answer

Concentration of alkyl halide only

Answer

Concentration of nucleophile only

Question 38

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

Question 39

39. 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 40

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

Question 41

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

Answer

Acid hydrolysis

Question 42

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

Question 43

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

Answer

Polar aprotic

Answer

Polar protic

Question 44

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

Question 45

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

Answer

Butanoic acid

Question 46

46. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Ethyl chloride

Answer

Methyl chloride

Answer

Tert-butyl chloride

Answer

Isopropyl chloride

Question 47

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

Answer

Methyl chloride

Answer

Tert-butyl bromide

Answer

Ethyl bromide

Answer

Isopropyl iodide

Question 48

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

Answer

Isopropyl chloride

Answer

1-chloropropane

Answer

Propyl chloride

Answer

2-chloropropane

Question 49

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

Answer

Nucleophile

Answer

Alkyl group

Answer

Halogen atom

Question 50

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

Answer

Front side

Question 51

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

Question 52

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

Answer

Both nucleophile and alkyl halide

Answer

Concentration of alkyl halide only

Answer

Concentration of nucleophile only

Answer

Temperature only

Question 53

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

Answer

Polar protic

Answer

Polar aprotic

Question 54

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

Question 55

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

Answer

Backside attack

Answer

One-step reaction

Answer

Rearrangement

Question 56

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

Question 57

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

Answer

Pentanoic acid

Answer

2-pentanol

Question 58

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

Answer

1-bromobutane

Answer

2-bromobutane

Answer

2-bromo-2-methylpropane

Answer

Tert-butyl bromide

Question 59

59. 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 halide leaves first

Answer

The least substituted product is formed

Question 60

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

Answer

Secondary fluoride

Answer

Tertiary bromide

Answer

Primary chloride

Answer

Methyl chloride

Question 61

61. Which condition favors elimination over substitution?

Answer

Strong base and heat

Answer

Nonpolar solvent

Answer

Cold temperature

Question 62

62. In an E2 reaction, the base removes:

Answer

A β-hydrogen

Answer

A hydrogen on the same carbon

Answer

A methyl group

Answer

The halogen

Question 63

63. Which base is typically used in E2 reactions?

Question 64

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

Answer

Trigonal bipyramidal

Answer

Tetrahedral

Answer

Trigonal planar

Answer 131

Carbocation intermediate

Answer 132

Inversion of configuration

Answer 133

First-order kinetics

Answer 134

Rearrangement possible

Answer 135

Acid hydrolysis

Answer 136

Acetic acid

Answer 137

It is neutral

Answer 138

It is unstable

Answer 139

It is too reactive

Answer 140

It forms strong C–F bonds

Answer 141

Butanoic acid

Answer 142

1-bromobutane

Answer 143

2-bromobutane

Answer 144

Tert-butyl bromide

Answer 145

2-bromo-2-methylpropane

Answer 146

Isopropyl iodide

Answer 147

Tert-butyl bromide

Answer 148

Methyl chloride

Answer 149

Ethyl bromide

Answer 150

Primary > Secondary > Tertiary

Answer 151

Methyl > Tertiary > Secondary

Answer 152

Tertiary > Secondary > Primary

Answer 153

Secondary > Tertiary > Primary

Answer 154

Rearrangement

Answer 155

Backside attack

Answer 156

One-step reaction

Answer 157

Polar protic solvent

Answer 158

Tertiary alkyl halide

Answer 159

Weak nucleophile

Answer 160

Strong nucleophile and primary alkyl halide

Answer 161

CH₃CH₂Cl

Answer 162

CH₃CHClCH₃

Answer 163

(CH₃)₃CCl

Answer 164

It is too reactive

Answer 165

It is unstable

Answer 166

It forms strong C–F bonds

Answer 167

It is neutral

Answer 168

Low temperature

Answer 169

Strong base and heat

Answer 170

Polar protic solvent

Answer 171

Methyl iodide

Answer 172

Isopropyl chloride

Answer 173

Ethyl bromide

Answer 174

Tert-butyl bromide

Answer 175

The most stable carbocation forms first

Answer 176

The halide leaves first

Answer 177

The least substituted product is formed

Answer 178

The more substituted alkene is the major product

Answer 179

Carbocation intermediate is formed

Answer 180

One-step process

Answer 181

Occurs with strong bases only

Answer 182

Needs non-polar solvent

Answer 183

A hydrogen on the same carbon

Answer 184

A methyl group

Answer 185

The halogen

Answer 186

A β-hydrogen

Answer 187

Carbocation intermediate is formed

Answer 188

One-step process

Answer 189

Occurs with strong bases only

Answer 190

Needs non-polar solvent

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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