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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.
Test Helpful For:	Chemistry Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Chemistry Interview Question Answer

Chemistry Transition Elements Practice Test Online With Explanation

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Page 1 of 2

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1. What type of hybridization is present in benzene?

None

sp³

sp²

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

HCl

NaCl

Br₂ (in CCl₄)

AgNO₃

3. What is the molecular formula of benzene?

C₆H₁₂

C₆H₁₀

C₆H₆

C₅H₁₀

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

Reducing agent

Oxidizing agent

Base

Catalyst

5. Which hydrocarbon burns with a sooty flame?

Benzene

Ethane

Propane

Ethene

6. What is the bond angle in benzene?

60°

109.5°

120°

90°

7. Which reaction is typical of alkenes?

Combustion only

Elimination

Addition

Substitution

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

Propyne

Butene

Propene

Propane

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

Propane

Cyclobutane

Ethene

Butane

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

p-p sideways

sp-sp

s-s head-on

sp²-sp²

11. How many π bonds are there in benzene?

12. What is the general formula of alkanes?

CnH2n–2

CnH2n+1

CnH2n

CnH2n+2

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

Alternating bonds

π electrons localized

Delocalized π molecular orbitals

π electrons in separate orbitals

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

Hydrolysis of ester

Nitration of benzene

Combustion of alkane

Addition of HBr to ethene

15. Which reagent is used for bromination of benzene?

HBr

Br₂ only

Br₂/UV

Br₂/FeBr₃

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

Toluene

Chlorobenzene

Benzaldehyde

Benzyl chloride

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

Benzaldehyde

Toluene

Phenol

Nitrobenzene

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

Methane

Benzene

Ethane

Butane

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

Undergo substitution

High reactivity to addition

Delocalized electrons

High stability

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

Structure with unpaired electrons

Kekulé structures

Structure with alternating double bonds

Structure with delocalized electrons

21. The stability of benzene is explained by:

Carbon-carbon single bonds only

Single and double bonds

Localized bonding

Delocalization of pi electrons

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

Double and single alternating bonds

Only sigma bonds

Sigma and delocalized pi bonds

Only pi bonds

23. Which condition favors the halogenation of benzene?

Presence of Lewis acid catalyst

Basic medium

UV light only

Dilute acid

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

Methylpropene

Butane

Cyclobutane

Ethane

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

Hund’s rule

Pauli exclusion principle

Huckel’s rule

Avogadro's law

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26. What is the shape of the benzene molecule?

Square

Tetrahedral

Linear

Hexagonal planar

27. How many sigma bonds are there in benzene?

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

Benzene

Ethane

Cyclopropane

Cyclohexane

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

sp²

sp³

dsp²

30. What is the result of sulfonation of benzene?

Nitrobenzene

Benzyl chloride

Phenol

Benzene sulfonic acid

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

Propyne

Propane

Butyne

Propene

32. Which of the following hydrocarbons is saturated?

Ethyne

Propane

Ethene

Butyne

33. Which of the following is an alkyne?

Propane

Butyne

Ethene

Butane

34. Benzene is best described as:

An aromatic compound

A cycloalkane

A saturated hydrocarbon

An alkene

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

Benzene

Toluene

Cyclohexane

Naphthalene

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

Oxidation

Chlorination

Electrophilic substitution

Hydrolysis

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

Ethane

Methane

Propane

Butane

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

Methane

Ethene

Ethane

Benzene

39. Why does benzene not decolorize bromine water?

It reduces bromine

It is saturated

It undergoes substitution instead

It forms addition products

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

Propane

Butane

Ethane

Isobutane

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

Benzene sulfonic acid

Nitrobenzene

Phenol

Benzaldehyde

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

Resonance and delocalized electrons

High molecular weight

Single and double bond alternation

Localized π bonds

43. The resonance structure of benzene was proposed by:

Lewis

Kekulé

Dalton

Mendeleev

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

Ethene

Cyclobutane

But-2-ene

Isobutane

45. Which functional group is present in alkenes?

C≡C

C=C

–COOH

–OH

46. How many π electrons are present in benzene?

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

Hydrolysis

Substitution

Elimination

Hydrogenation

48. Which of the following shows aromatic behavior?

Cyclopentadiene

Benzene

Cyclobutadiene

Cyclohexene

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

Hydrolysis

Substitution

Polymerization

Addition

Complete Guide for Chemistry of Hydrocarbons Online Mcqs Test

Chemistry of Hydrocarbons Online Mcqs Test is a crucial part of the selection process for government jobs and entrance exams. This online test allows you to practice without any cost.

Why Take This Test?

We have compiled these questions from past papers of PPSC, FPSC, NTS, and OTS. By attempting this quiz, you will:

Understand the difficulty level of the actual exam.
Identify your weak areas in General Knowledge and Current Affairs.

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Important Chemistry Transition Elements Question and Answer

Chemistry Transition Elements Practice Test Online With Explanation

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Complete Guide for Chemistry of Hydrocarbons Online Mcqs Test

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