Chemistry Alkyl Halides Online Mcqs Test

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Question 1

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

Answer

Radical chain reaction

Answer

Two-step with carbocation intermediate

Answer

Concerted elimination

Answer

One-step with inversion

Question 2

2. The stability of carbocations follows the order:

Answer

Methyl > Tertiary > Secondary

Answer

Primary > Secondary > Tertiary

Answer

Secondary > Tertiary > Primary

Answer

Tertiary > Secondary > Primary

Question 3

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

Answer

Butanoic acid

Question 4

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

Answer

Butanoic acid

Question 5

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

Answer

Trigonal bipyramidal

Answer

Tetrahedral

Answer

Trigonal planar

Question 6

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

Question 7

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

Question 8

8. In an E2 reaction, the base removes:

Answer

A β-hydrogen

Answer

A hydrogen on the same carbon

Answer

The halogen

Answer

A methyl group

Question 9

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

Answer

Polar protic

Answer

Polar aprotic

Question 10

10. Why is fluoride a poor leaving group?

Answer

It is too reactive

Answer

It is neutral

Answer

It forms strong C–F bonds

Answer

It is unstable

Question 11

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

Answer

Concentration of nucleophile only

Answer

Both nucleophile and alkyl halide

Answer

Temperature only

Answer

Concentration of alkyl halide only

Question 12

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

Answer

One-step with inversion

Answer

Concerted elimination

Answer

Radical chain reaction

Answer

Two-step with carbocation intermediate

Question 13

13. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 14

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

Answer

Rearranged

Question 15

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

Answer

Butanoic acid

Question 16

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

Answer

Pentanoic acid

Answer

2-pentanol

Question 17

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

Answer

The least substituted product is formed

Answer

The halide leaves first

Answer

The most stable carbocation forms first

Answer

The more substituted alkene is the major product

Question 18

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

Answer

Rearranged

Question 19

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

Question 20

20. Which is a characteristic of SN2 mechanism?

Answer

Carbocation intermediate

Answer

First-order kinetics

Answer

Inversion of configuration

Answer

Rearrangement possible

Question 21

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

Answer

2-bromobutane

Answer

2-bromo-2-methylpropane

Answer

Tert-butyl bromide

Answer

1-bromobutane

Question 22

22. Which of the following solvents favors SN2 reactions?

Answer

Acetic acid

Question 23

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

Answer

Tert-butyl bromide

Answer

Ethyl bromide

Answer

Isopropyl chloride

Answer

Methyl iodide

Question 24

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

Answer

Pentanoic acid

Answer

2-pentanol

Question 25

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

Question 26

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

Answer

Tertiary bromide

Answer

Secondary fluoride

Answer

Primary chloride

Answer

Methyl chloride

Question 27

27. Which condition favors elimination over substitution?

Answer

Nonpolar solvent

Answer

Strong base and heat

Answer

Cold temperature

Question 28

28. 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 29

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

Question 30

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

Question 31

31. 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 32

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

Question 33

33. What is the general formula for alkyl halides?

Question 34

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

Question 35

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

Question 36

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

Question 37

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

Answer

CH₃CHClCH₃

Answer

CH₃CH₂Cl

Answer

(CH₃)₃CCl

Question 38

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

Answer

2-chloropropane

Answer

Propyl chloride

Answer

Isopropyl chloride

Answer

1-chloropropane

Question 39

39. The stability of carbocations follows the order:

Answer

Primary > Secondary > Tertiary

Answer

Secondary > Tertiary > Primary

Answer

Methyl > Tertiary > Secondary

Answer

Tertiary > Secondary > Primary

Question 40

40. Which condition favors elimination over substitution?

Answer

Strong base and heat

Answer

Nonpolar solvent

Answer

Cold temperature

Question 41

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

Question 42

42. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Tert-butyl chloride

Answer

Methyl chloride

Answer

Ethyl chloride

Answer

Isopropyl chloride

Question 43

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

Question 44

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

Answer

Tert-butyl bromide

Answer

Methyl chloride

Answer

Ethyl bromide

Answer

Isopropyl iodide

Question 45

45. What is the general formula for alkyl halides?

Question 46

46. Why is fluoride a poor leaving group?

Answer

It is too reactive

Answer

It is unstable

Answer

It is neutral

Answer

It forms strong C–F bonds

Question 47

47. Which factor increases the rate of SN1 reactions?

Answer

Polar protic solvent

Answer

Strong nucleophile

Answer

Polar aprotic solvent

Question 48

48. 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 49

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

Answer

(CH₃)₃CCl

Answer

CH₃CHClCH₃

Answer

CH₃CH₂Cl

Question 50

50. Which alkyl halide undergoes SN2 reaction most readily?

Answer

Isopropyl chloride

Answer

Methyl chloride

Answer

Ethyl chloride

Answer

Tert-butyl chloride

Question 51

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

Answer

Methyl chloride

Answer

Isopropyl iodide

Answer

Ethyl bromide

Answer

Tert-butyl bromide

Question 52

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

Answer

Tetrahedral

Answer

Trigonal bipyramidal

Answer

Trigonal planar

Question 53

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

Question 54

54. Which statement is true about E1 reactions?

Answer

Needs non-polar solvent

Answer

Carbocation intermediate is formed

Answer

Occurs with strong bases only

Answer

One-step process

Question 55

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

Answer

One-step reaction

Answer

Rearrangement

Answer

Backside attack

Question 56

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

Answer

Propyl chloride

Answer

Isopropyl chloride

Answer

2-chloropropane

Answer

1-chloropropane

Question 57

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

Question 58

58. Which base is typically used in E2 reactions?

Question 59

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

Question 60

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

Answer

The halide leaves first

Answer

The more substituted alkene is the major product

Answer

The most stable carbocation forms first

Answer

The least substituted product is formed

Question 61

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

Answer

Polar protic

Answer

Polar aprotic

Question 62

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

Answer

Halogen atom

Answer

Nucleophile

Answer

Alkyl group

Question 63

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

Question 64

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

Answer

Temperature only

Answer

Concentration of alkyl halide only

Answer

Concentration of nucleophile only

Answer

Both nucleophile and alkyl halide

Answer 143

Alkyl group

Answer 144

Halogen atom

Answer 145

Nucleophile

Answer 146

Rearrangement

Answer 147

One-step reaction

Answer 148

Backside attack

Answer 149

Polar aprotic solvent

Answer 150

Strong nucleophile

Answer 151

Polar protic solvent

Answer 152

Ethyl bromide

Answer 153

Isopropyl chloride

Answer 154

Methyl iodide

Answer 155

Tert-butyl bromide

Answer 156

Rearrangement possible

Answer 157

Carbocation intermediate

Answer 158

First-order kinetics

Answer 159

Inversion of configuration

Answer 160

Tert-butyl bromide

Answer 161

2-bromobutane

Answer 162

1-bromobutane

Answer 163

2-bromo-2-methylpropane

Answer 164

Butanoic acid

Answer 165

Front side

Answer 166

Strong nucleophile and primary alkyl halide

Answer 167

Tertiary alkyl halide

Answer 168

Polar protic solvent

Answer 169

Weak nucleophile

Answer 170

Front side

Answer 171

Low temperature

Answer 172

Polar protic solvent

Answer 173

Strong base and heat

Answer 174

Tertiary alkyl halide

Answer 175

Polar protic solvent

Answer 176

Weak nucleophile

Answer 177

Strong nucleophile and primary alkyl halide

Answer 178

Methyl chloride

Answer 179

1-bromobutane

Answer 180

2-chloro-2-methylpropane

Answer 181

2-bromobutane

Answer 182

Acid hydrolysis

Answer 183

Low temperature

Answer 184

Strong base and heat

Answer 185

Polar protic solvent

Answer 186

Acid hydrolysis

Answer 187

Primary chloride

Answer 188

Secondary fluoride

Answer 189

Tertiary bromide

Answer 190

Methyl 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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