Chemistry of Hydrocarbons Online Mcqs Test

Mustansar KhanLast Updated: October 14, 2025

Important Chemistry Transition Elements Question and Answer

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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Chemistry Transition Elements Practice Test Online With Explanation

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1. Which reaction is typical of alkenes?

Substitution

Elimination

Addition

Combustion only

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

Propane

Propyne

Butene

Propene

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

Propane

Methane

Butane

Ethane

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

Substitution

Polymerization

Hydrolysis

Addition

5. What is the general formula of alkanes?

CnH2n+2

CnH2n–2

CnH2n+1

CnH2n

6. Which functional group is present in alkenes?

C=C

C≡C

–COOH

–OH

7. Which of the following shows aromatic behavior?

Benzene

Cyclohexene

Cyclopentadiene

Cyclobutadiene

8. How many π electrons are present in benzene?

9. Which reagent is used for bromination of benzene?

Br₂/FeBr₃

Br₂ only

Br₂/UV

HBr

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

Reducing agent

Catalyst

Base

Oxidizing agent

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

Benzaldehyde

Phenol

Benzene sulfonic acid

Nitrobenzene

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

π electrons in separate orbitals

Alternating bonds

Delocalized π molecular orbitals

π electrons localized

13. Which hydrocarbon burns with a sooty flame?

Ethene

Propane

Benzene

Ethane

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

Cyclobutane

Ethene

Isobutane

But-2-ene

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

Single and double bond alternation

Localized π bonds

Resonance and delocalized electrons

High molecular weight

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

Undergo substitution

High reactivity to addition

Delocalized electrons

High stability

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

Ethane

Cyclohexane

Benzene

Cyclopropane

18. How many sigma bonds are there in benzene?

19. What is the shape of the benzene molecule?

Linear

Square

Hexagonal planar

Tetrahedral

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

Cyclobutane

Ethane

Butane

Methylpropene

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

Benzaldehyde

Benzyl chloride

Chlorobenzene

Toluene

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

Isobutane

Propane

Butane

Ethane

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

Ethane

Benzene

Methane

Ethene

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

Benzaldehyde

Nitrobenzene

Phenol

Toluene

25. Which of the following is an alkyne?

Butane

Ethene

Butyne

Propane

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26. How many π bonds are there in benzene?

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

Propane

Propene

Propyne

Butyne

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

Cyclohexane

Toluene

Naphthalene

Benzene

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

Chlorination

Hydrolysis

Electrophilic substitution

Oxidation

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

dsp²

sp³

sp²

31. What is the result of sulfonation of benzene?

Phenol

Nitrobenzene

Benzene sulfonic acid

Benzyl chloride

32. The resonance structure of benzene was proposed by:

Mendeleev

Kekulé

Dalton

Lewis

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

sp-sp

p-p sideways

sp²-sp²

s-s head-on

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

Combustion of alkane

Hydrolysis of ester

Nitration of benzene

Addition of HBr to ethene

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

Hydrolysis

Hydrogenation

Elimination

Substitution

36. The stability of benzene is explained by:

Localized bonding

Single and double bonds

Delocalization of pi electrons

Carbon-carbon single bonds only

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

Cyclobutane

Propane

Ethene

Butane

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

Double and single alternating bonds

Only pi bonds

Only sigma bonds

Sigma and delocalized pi bonds

39. Why does benzene not decolorize bromine water?

It undergoes substitution instead

It is saturated

It reduces bromine

It forms addition products

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

Benzene

Methane

Ethane

Butane

41. Benzene is best described as:

An aromatic compound

A cycloalkane

An alkene

A saturated hydrocarbon

42. What type of hybridization is present in benzene?

sp³

None

sp²

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

AgNO₃

NaCl

HCl

Br₂ (in CCl₄)

44. Which of the following hydrocarbons is saturated?

Ethene

Propane

Butyne

Ethyne

45. Which condition favors the halogenation of benzene?

UV light only

Dilute acid

Presence of Lewis acid catalyst

Basic medium

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

Avogadro's law

Pauli exclusion principle

Huckel’s rule

Hund’s rule

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

Structure with delocalized electrons

Structure with alternating double bonds

Kekulé structures

Structure with unpaired electrons

48. What is the molecular formula of benzene?

C₆H₁₂

C₆H₁₀

C₅H₁₀

C₆H₆

49. What is the bond angle in benzene?

109.5°

60°

120°

90°

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Mustansar KhanLast Updated: October 14, 2025

Important Chemistry Transition Elements Question and Answer

Chemistry Transition Elements Practice Test Online With Explanation

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