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MDCAT Chemistry of Hydrocarbons Test Online

Mustansar KhanLast Updated: May 26, 2025

Chemistry Transition Elements MCQS Online Test

MDCAT Chemistry Transition Elements Chapter Online Test

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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MDCAT Chemistry Transition Elements Test

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

Hydrolysis of ester

Combustion of alkane

Addition of HBr to ethene

Nitration of benzene

2. Which reagent is used for bromination of benzene?

Br₂ only

Br₂/UV

HBr

Br₂/FeBr₃

3. Which functional group is present in alkenes?

–COOH

C=C

–OH

C≡C

4. Which hydrocarbon burns with a sooty flame?

Propane

Ethane

Ethene

Benzene

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

Propyne

Propene

Propane

Butyne

6. Why does benzene not decolorize bromine water?

It forms addition products

It reduces bromine

It undergoes substitution instead

It is saturated

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

Chlorination

Oxidation

Electrophilic substitution

Hydrolysis

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

Toluene

Nitrobenzene

Benzaldehyde

Phenol

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

Methane

Ethane

Benzene

Butane

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

Reducing agent

Catalyst

Base

Oxidizing agent

11. Which of the following hydrocarbons is saturated?

Butyne

Ethene

Propane

Ethyne

12. The stability of benzene is explained by:

Localized bonding

Single and double bonds

Carbon-carbon single bonds only

Delocalization of pi electrons

13. What is the shape of the benzene molecule?

Hexagonal planar

Square

Tetrahedral

Linear

14. Which reaction is typical of alkenes?

Addition

Substitution

Elimination

Combustion only

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

Butane

Ethane

Propane

Isobutane

16. Which condition favors the halogenation of benzene?

Dilute acid

Presence of Lewis acid catalyst

UV light only

Basic medium

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

s-s head-on

sp-sp

sp²-sp²

p-p sideways

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

Ethene

Propane

Cyclobutane

Butane

19. What type of hybridization is present in benzene?

sp³

sp²

None

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

Hydrolysis

Substitution

Polymerization

Addition

21. How many π bonds are there in benzene?

22. What is the molecular formula of benzene?

C₆H₆

C₆H₁₀

C₆H₁₂

C₅H₁₀

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

Br₂ (in CCl₄)

NaCl

HCl

AgNO₃

24. What is the result of sulfonation of benzene?

Phenol

Benzyl chloride

Benzene sulfonic acid

Nitrobenzene

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

Benzyl chloride

Chlorobenzene

Benzaldehyde

Toluene

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

Propene

Butene

Propane

Propyne

27. Benzene is best described as:

A cycloalkane

A saturated hydrocarbon

An aromatic compound

An alkene

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

Only sigma bonds

Double and single alternating bonds

Only pi bonds

Sigma and delocalized pi bonds

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

Delocalized π molecular orbitals

π electrons in separate orbitals

π electrons localized

Alternating bonds

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

Undergo substitution

Delocalized electrons

High stability

High reactivity to addition

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

Avogadro's law

Huckel’s rule

Pauli exclusion principle

Hund’s rule

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

Naphthalene

Cyclohexane

Toluene

Benzene

33. Which of the following shows aromatic behavior?

Cyclohexene

Cyclopentadiene

Benzene

Cyclobutadiene

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

Kekulé structures

Structure with alternating double bonds

Structure with unpaired electrons

Structure with delocalized electrons

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

Isobutane

But-2-ene

Cyclobutane

Ethene

36. What is the general formula of alkanes?

CnH2n–2

CnH2n+1

CnH2n

CnH2n+2

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

Methylpropene

Ethane

Cyclobutane

Butane

38. How many π electrons are present in benzene?

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

Ethene

Methane

Ethane

Benzene

40. What is the bond angle in benzene?

90°

60°

120°

109.5°

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

Substitution

Elimination

Hydrogenation

Hydrolysis

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

Nitrobenzene

Benzene sulfonic acid

Benzaldehyde

Phenol

43. Which of the following is an alkyne?

Butane

Butyne

Propane

Ethene

44. The resonance structure of benzene was proposed by:

Lewis

Mendeleev

Dalton

Kekulé

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

sp³

dsp²

sp²

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

Localized π bonds

Resonance and delocalized electrons

High molecular weight

Single and double bond alternation

47. How many sigma bonds are there in benzene?

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

Ethane

Cyclohexane

Cyclopropane

Benzene

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

Propane

Ethane

Butane

Methane

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Mustansar KhanLast Updated: May 26, 2025

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MDCAT Chemistry of Hydrocarbons Test Online

Chemistry Transition Elements MCQS Online Test

MDCAT Chemistry Transition Elements Chapter Online Test

MDCAT Chemistry Transition Elements Test

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Chemistry Transition Elements MCQS Online Test

MDCAT Chemistry Transition Elements Chapter Online Test

MDCAT Chemistry Transition Elements Test

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