Chemistry of Hydrocarbons Online Mcqs Test

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Question 1

1. Which of the following is not a valid resonance structure of benzene?

Answer

Structure with alternating double bonds

Answer

Structure with delocalized electrons

Answer

Kekulé structures

Answer

Structure with unpaired electrons

Question 2

2. Which of the following describes the MO model of benzene?

Answer

Alternating bonds

Answer

π electrons in separate orbitals

Answer

π electrons localized

Answer

Delocalized π molecular orbitals

Question 3

3. Which of the following alkanes has a branched structure?

Question 4

4. Which of the following is a closed-chain hydrocarbon?

Answer

Cyclobutane

Question 5

5. What kind of bonding exists in the benzene ring?

Answer

Sigma and delocalized pi bonds

Answer

Double and single alternating bonds

Answer

Only pi bonds

Answer

Only sigma bonds

Question 6

6. What is the outcome when benzene reacts with CH₃Cl in the presence of AlCl₃?

Answer

Chlorobenzene

Answer

Benzyl chloride

Answer

Benzaldehyde

Question 7

7. Which of the following is an open-chain hydrocarbon?

Answer

Cyclopropane

Answer

Cyclohexane

Question 8

8. Which hydrocarbon burns with a sooty flame?

Question 9

9. Which of the following is the correct name for CH₂=CH–CH₃?

Question 10

10. The resonance structure of benzene was proposed by:

Question 11

11. What is the role of FeCl₃ in benzene chlorination?

Answer

Oxidizing agent

Answer

Reducing agent

Question 12

12. How many sigma bonds are there in benzene?

Question 13

13. What is the result of sulfonation of benzene?

Answer

Benzyl chloride

Answer

Benzene sulfonic acid

Answer

Nitrobenzene

Question 14

14. Benzene is best described as:

Answer

A saturated hydrocarbon

Answer

A cycloalkane

Answer

An aromatic compound

Question 15

15. Which condition favors the halogenation of benzene?

Answer

Dilute acid

Answer

Basic medium

Answer

Presence of Lewis acid catalyst

Answer

UV light only

Question 16

16. The stability of benzene is explained by:

Answer

Localized bonding

Answer

Delocalization of pi electrons

Answer

Single and double bonds

Answer

Carbon-carbon single bonds only

Question 17

17. What is the hybridization of carbon atoms in alkanes?

Question 18

18. Which reagent is used for bromination of benzene?

Answer

Br₂ only

Answer

Br₂/FeBr₃

Question 19

19. Which of the following is not a property of aromatic hydrocarbons?

Answer

Delocalized electrons

Answer

Undergo substitution

Answer

High stability

Answer

High reactivity to addition

Question 20

20. Which of the following shows aromatic behavior?

Answer

Cyclohexene

Answer

Cyclopentadiene

Answer

Cyclobutadiene

Question 21

21. What is the IUPAC name of CH≡C–CH₃?

Question 22

22. Which of the following best explains the stability of benzene?

Answer

High molecular weight

Answer

Localized π bonds

Answer

Single and double bond alternation

Answer

Resonance and delocalized electrons

Question 23

23. Which of the following is formed during nitration of benzene?

Answer

Nitrobenzene

Answer

Benzaldehyde

Question 24

24. What is the shape of the benzene molecule?

Answer

Tetrahedral

Answer

Hexagonal planar

Question 25

25. How many π electrons are present in benzene?

Question 26

26. What type of hybridization is present in benzene?

Question 27

27. What is the molecular formula of benzene?

Answer

C₅H₁₀

Answer

C₆H₁₂

Answer

C₆H₁₀

Question 28

28. Which functional group is present in alkenes?

Question 29

29. Which reaction is typical of alkenes?

Answer

Elimination

Answer

Combustion only

Answer

Substitution

Question 30

30. Which rule is used to determine aromaticity in compounds like benzene?

Answer

Huckel’s rule

Answer

Hund’s rule

Answer

Avogadro's law

Answer

Pauli exclusion principle

Question 31

31. Which of the following is a positional isomer of but-1-ene?

Answer

Cyclobutane

Question 32

32. What is the product when benzene is treated with conc. HNO₃ and conc. H₂SO₄?

Answer

Nitrobenzene

Answer

Benzene sulfonic acid

Answer

Benzaldehyde

Question 33

33. Which of the following reactions is characteristic of benzene?

Answer

Hydrolysis

Answer

Substitution

Answer

Polymerization

Question 34

34. What is the bond angle in benzene?

Question 35

35. Which compound will give a positive test with Baeyer's reagent?

Question 36

36. Which of the following is an alkyne?

Question 37

37. The reaction of benzene with Cl₂ in the presence of FeCl₃ is called:

Answer

Chlorination

Answer

Hydrolysis

Answer

Electrophilic substitution

Question 38

38. Which of the following is an example of an electrophilic substitution reaction?

Answer

Hydrolysis of ester

Answer

Nitration of benzene

Answer

Addition of HBr to ethene

Answer

Combustion of alkane

Question 39

39. Which compound is used as a test for unsaturation?

Answer

Br₂ (in CCl₄)

Question 40

40. Which of the following is a reaction of alkynes?

Answer

Hydrogenation

Answer

Elimination

Answer

Substitution

Answer

Hydrolysis

Question 41

41. What is the general formula of alkanes?

Question 42

42. Which of the following is an isomer of butene?

Answer

Methylpropene

Answer

Cyclobutane

Question 43

43. Why does benzene not decolorize bromine water?

Answer

It undergoes substitution instead

Answer

It is saturated

Answer

It reduces bromine

Answer

It forms addition products

Question 44

44. Which of the following hydrocarbons is saturated?

Question 45

45. Which type of orbital overlap forms the π bonds in benzene?

Answer

s-s head-on

Answer

p-p sideways

Question 46

46. Which of the following is not an aromatic compound?

Answer

Naphthalene

Answer

Cyclohexane

Question 47

47. How many π bonds are there in benzene?

Question 48

48. Which of the following hydrocarbons has the highest degree of unsaturation?

Question 49

49. What is the IUPAC name of CH₃–CH₂–CH₃?

Question 50

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Total Questions:	49
Time Allowed:	30 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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