Chemistry of Hydrocarbons Online Mcqs Test

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Question 1

1. What is the molecular formula of benzene?

Answer

C₅H₁₀

Answer

C₆H₁₂

Answer

C₆H₁₀

Question 2

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

Answer

p-p sideways

Answer

s-s head-on

Question 3

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

Answer

Electrophilic substitution

Answer

Hydrolysis

Answer

Chlorination

Question 4

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

Answer

Addition of HBr to ethene

Answer

Hydrolysis of ester

Answer

Combustion of alkane

Answer

Nitration of benzene

Question 5

5. Which reaction is typical of alkenes?

Answer

Elimination

Answer

Substitution

Answer

Combustion only

Question 6

6. Which condition favors the halogenation of benzene?

Answer

UV light only

Answer

Dilute acid

Answer

Basic medium

Answer

Presence of Lewis acid catalyst

Question 7

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

Answer

Cyclobutane

Question 8

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

Question 9

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

Question 10

10. The stability of benzene is explained by:

Answer

Carbon-carbon single bonds only

Answer

Delocalization of pi electrons

Answer

Localized bonding

Answer

Single and double bonds

Question 11

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

Answer

Cyclohexane

Answer

Cyclopropane

Question 12

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

Answer

Benzyl chloride

Answer

Chlorobenzene

Answer

Benzaldehyde

Question 13

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

Answer

Benzaldehyde

Answer

Nitrobenzene

Question 14

14. Which of the following is an alkyne?

Question 15

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

Answer

Avogadro's law

Answer

Hund’s rule

Answer

Huckel’s rule

Answer

Pauli exclusion principle

Question 16

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

Answer

Benzaldehyde

Answer

Benzene sulfonic acid

Answer

Nitrobenzene

Question 17

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

Question 18

18. Which hydrocarbon burns with a sooty flame?

Question 19

19. Benzene is best described as:

Answer

A cycloalkane

Answer

An aromatic compound

Answer

A saturated hydrocarbon

Question 20

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

Answer

Methylpropene

Answer

Cyclobutane

Question 21

21. How many sigma bonds are there in benzene?

Question 22

22. 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 23

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

Answer

Cyclohexane

Answer

Naphthalene

Question 24

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

Answer

Undergo substitution

Answer

High stability

Answer

Delocalized electrons

Answer

High reactivity to addition

Question 25

25. What is the general formula of alkanes?

Question 26

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

Answer

Elimination

Answer

Substitution

Answer

Hydrolysis

Answer

Hydrogenation

Question 27

27. What is the bond angle in benzene?

Question 28

28. Which of the following hydrocarbons is saturated?

Question 29

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

Answer

Polymerization

Answer

Substitution

Answer

Hydrolysis

Question 30

30. Why does benzene not decolorize bromine water?

Answer

It is saturated

Answer

It forms addition products

Answer

It undergoes substitution instead

Answer

It reduces bromine

Question 31

31. Which of the following shows aromatic behavior?

Answer

Cyclopentadiene

Answer

Cyclobutadiene

Answer

Cyclohexene

Question 32

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

Answer

Br₂ (in CCl₄)

Question 33

33. The resonance structure of benzene was proposed by:

Question 34

34. Which functional group is present in alkenes?

Question 35

35. What type of hybridization is present in benzene?

Question 36

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

Answer

Structure with unpaired electrons

Answer

Structure with alternating double bonds

Answer

Kekulé structures

Answer

Structure with delocalized electrons

Question 37

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

Answer

Single and double bond alternation

Answer

Localized π bonds

Answer

Resonance and delocalized electrons

Answer

High molecular weight

Question 38

38. Which reagent is used for bromination of benzene?

Answer

Br₂/FeBr₃

Answer

Br₂ only

Question 39

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

Question 40

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

Answer

Oxidizing agent

Answer

Reducing agent

Question 41

41. What is the shape of the benzene molecule?

Answer

Hexagonal planar

Answer

Tetrahedral

Question 42

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

Question 43

43. How many π bonds are there in benzene?

Question 44

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

Answer

Cyclobutane

Question 45

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

Answer

Only pi bonds

Answer

Only sigma bonds

Answer

Sigma and delocalized pi bonds

Answer

Double and single alternating bonds

Question 46

46. How many π electrons are present in benzene?

Question 47

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

Question 48

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

Question 49

49. What is the result of sulfonation of benzene?

Answer

Benzyl chloride

Answer

Nitrobenzene

Answer

Benzene sulfonic acid

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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