Chemistry of Hydrocarbons Online Mcqs Test

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Question 1

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

Answer

Br₂ (in CCl₄)

Question 2

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

Answer

Electrophilic substitution

Answer

Hydrolysis

Answer

Chlorination

Question 3

3. Which hydrocarbon burns with a sooty flame?

Question 4

4. How many π electrons are present in benzene?

Question 5

5. How many sigma bonds are there in benzene?

Question 6

6. The stability of benzene is explained by:

Answer

Delocalization of pi electrons

Answer

Localized bonding

Answer

Single and double bonds

Answer

Carbon-carbon single bonds only

Question 7

7. What is the bond angle in benzene?

Question 8

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

Answer

Hund’s rule

Answer

Pauli exclusion principle

Answer

Avogadro's law

Answer

Huckel’s rule

Question 9

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

Answer

Benzyl chloride

Answer

Chlorobenzene

Answer

Benzaldehyde

Question 10

10. Which of the following shows aromatic behavior?

Answer

Cyclopentadiene

Answer

Cyclohexene

Answer

Cyclobutadiene

Question 11

11. Which reaction is typical of alkenes?

Answer

Substitution

Answer

Combustion only

Answer

Elimination

Question 12

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

Answer

Cyclohexane

Answer

Cyclopropane

Question 13

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

Answer

Methylpropene

Answer

Cyclobutane

Question 14

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

Question 15

15. Which reagent is used for bromination of benzene?

Answer

Br₂/FeBr₃

Answer

Br₂ only

Question 16

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

Answer

Reducing agent

Answer

Oxidizing agent

Question 17

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

Answer

Nitrobenzene

Answer

Benzaldehyde

Answer

Benzene sulfonic acid

Question 18

18. Why does benzene not decolorize bromine water?

Answer

It reduces bromine

Answer

It forms addition products

Answer

It is saturated

Answer

It undergoes substitution instead

Question 19

19. Which of the following is an alkyne?

Question 20

20. How many π bonds are there in benzene?

Question 21

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

Answer

Cyclobutane

Question 22

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

Answer

Localized π bonds

Answer

Resonance and delocalized electrons

Answer

Single and double bond alternation

Answer

High molecular weight

Question 23

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

Answer

Hydrogenation

Answer

Substitution

Answer

Hydrolysis

Answer

Elimination

Question 24

24. What is the result of sulfonation of benzene?

Answer

Nitrobenzene

Answer

Benzyl chloride

Answer

Benzene sulfonic acid

Question 25

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

Answer

Undergo substitution

Answer

High reactivity to addition

Answer

Delocalized electrons

Answer

High stability

Question 26

26. What is the shape of the benzene molecule?

Answer

Tetrahedral

Answer

Hexagonal planar

Question 27

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

Answer

s-s head-on

Answer

p-p sideways

Question 28

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

Question 29

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

Answer

Nitrobenzene

Answer

Benzaldehyde

Question 30

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

Question 31

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

Answer

Only pi bonds

Answer

Sigma and delocalized pi bonds

Answer

Only sigma bonds

Answer

Double and single alternating bonds

Question 32

32. Which functional group is present in alkenes?

Question 33

33. Which condition favors the halogenation of benzene?

Answer

UV light only

Answer

Basic medium

Answer

Dilute acid

Answer

Presence of Lewis acid catalyst

Question 34

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

Answer

π electrons localized

Answer

π electrons in separate orbitals

Answer

Alternating bonds

Answer

Delocalized π molecular orbitals

Question 35

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

Question 36

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

Answer

Cyclohexane

Answer

Naphthalene

Question 37

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

Question 38

38. What is the molecular formula of benzene?

Answer

C₅H₁₀

Answer

C₆H₁₂

Answer

C₆H₁₀

Question 39

39. Which of the following hydrocarbons is saturated?

Question 40

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

Answer

Nitration of benzene

Answer

Hydrolysis of ester

Answer

Combustion of alkane

Answer

Addition of HBr to ethene

Question 41

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

Question 42

42. Benzene is best described as:

Answer

An aromatic compound

Answer

A saturated hydrocarbon

Answer

A cycloalkane

Question 43

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

Answer

Substitution

Answer

Polymerization

Answer

Hydrolysis

Question 44

44. What is the general formula of alkanes?

Question 45

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

Answer

Cyclobutane

Question 46

46. 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 47

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

Question 48

48. The resonance structure of benzene was proposed by:

Question 49

49. What type of hybridization is present in benzene?

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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