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

Phenol

Nitrobenzene

Benzene sulfonic acid

Benzaldehyde

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

Methane

Propane

Butane

Ethane

3. What is the bond angle in benzene?

60°

90°

120°

109.5°

4. How many π bonds are there in benzene?

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

Combustion of alkane

Nitration of benzene

Hydrolysis of ester

Addition of HBr to ethene

6. The resonance structure of benzene was proposed by:

Dalton

Kekulé

Mendeleev

Lewis

7. Why does benzene not decolorize bromine water?

It undergoes substitution instead

It is saturated

It reduces bromine

It forms addition products

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

Butane

Cyclobutane

Ethene

Propane

9. What is the general formula of alkanes?

CnH2n–2

CnH2n+2

CnH2n

CnH2n+1

10. The stability of benzene is explained by:

Carbon-carbon single bonds only

Single and double bonds

Localized bonding

Delocalization of pi electrons

11. Which of the following is an alkyne?

Ethene

Propane

Butyne

Butane

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

Benzene

Methane

Butane

Ethane

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

Hydrolysis

Polymerization

Addition

Substitution

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

p-p sideways

sp²-sp²

s-s head-on

sp-sp

15. 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

16. Which reagent is used for bromination of benzene?

HBr

Br₂/UV

Br₂/FeBr₃

Br₂ only

17. Benzene is best described as:

An aromatic compound

A cycloalkane

A saturated hydrocarbon

An alkene

18. How many π electrons are present in benzene?

19. Which condition favors the halogenation of benzene?

Basic medium

Dilute acid

Presence of Lewis acid catalyst

UV light only

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

Delocalized π molecular orbitals

π electrons in separate orbitals

Alternating bonds

π electrons localized

21. How many sigma bonds are there in benzene?

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

Butene

Propene

Propane

Propyne

23. Which of the following hydrocarbons is saturated?

Butyne

Propane

Ethene

Ethyne

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

Hund’s rule

Huckel’s rule

Avogadro's law

Pauli exclusion principle

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

Benzene

Ethane

Methane

Ethene

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26. Which reaction is typical of alkenes?

Substitution

Addition

Elimination

Combustion only

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

sp²

sp³

dsp²

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

Propane

Butane

Isobutane

Ethane

29. Which hydrocarbon burns with a sooty flame?

Ethene

Benzene

Propane

Ethane

30. What is the molecular formula of benzene?

C₆H₆

C₅H₁₀

C₆H₁₂

C₆H₁₀

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

Benzene

Naphthalene

Cyclohexane

Toluene

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

Localized π bonds

Single and double bond alternation

High molecular weight

Resonance and delocalized electrons

33. What type of hybridization is present in benzene?

sp²

sp³

None

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

Structure with alternating double bonds

Structure with delocalized electrons

Structure with unpaired electrons

Kekulé structures

35. Which functional group is present in alkenes?

C≡C

C=C

–OH

–COOH

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

Undergo substitution

High reactivity to addition

High stability

Delocalized electrons

37. Which of the following shows aromatic behavior?

Benzene

Cyclobutadiene

Cyclohexene

Cyclopentadiene

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

Butane

Ethane

Cyclobutane

Methylpropene

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

Hydrogenation

Elimination

Substitution

Hydrolysis

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

Cyclohexane

Cyclopropane

Benzene

Ethane

41. What is the shape of the benzene molecule?

Linear

Square

Tetrahedral

Hexagonal planar

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

Isobutane

Ethene

But-2-ene

Cyclobutane

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

Base

Oxidizing agent

Reducing agent

Catalyst

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

Br₂ (in CCl₄)

AgNO₃

NaCl

HCl

45. What is the result of sulfonation of benzene?

Benzene sulfonic acid

Nitrobenzene

Phenol

Benzyl chloride

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

Chlorination

Hydrolysis

Electrophilic substitution

Oxidation

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

Phenol

Toluene

Benzaldehyde

Nitrobenzene

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

Propyne

Propane

Propene

Butyne

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

Benzyl chloride

Benzaldehyde

Chlorobenzene

Toluene

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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

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