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Fundamental Principles of Organic Chemistry Online Mcqs Test

Malik TahirLast Updated: October 14, 2025

Important Fundamental Principles of Organic Question and Answer

Total Questions:	119
Time Allowed:	60 Minutes
Total Marks:	119
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Chemistry Fundamental Principles of Organic Practice Test Online With Explanation

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Page 1 of 5

Chemistry

1. Petroleum is mainly a mixture of

Phenols

Unsaturated hydrocarbon

Saturated hydrocarbons

Compounds of S

2. The isomers which can be inter converted through rotation around a single bond are:

Positional isomers

Conformers

Enantiomers

Diastereomers

3. In catalytic cracking, the typical catalyst used is

SiO₂+Al₂O₃

SiO₂

Al₂O₃

4. Which molecule is nonpolar?

CHCl₃

BeH₂

H₂Se

PF₃

5. Which of the following gases is used for illuminating purpose?

Butane

Methane

Ethane

Propane

6. Which of the following in not an organic compound?

Methane

Urea

Ammonium cyanate

Glucose

7. The four bonds of carbon in methane are directed towards the corners of

Tetrahedron

Pentagon

Cube

Hexagon

8. The compounds containing –SH as a functional group are called

Thiols

Sulphides

Hydrogen sulphides

Alcohols

9. An alkene forms isomers if the number of carbon atoms is at least

10. The process in which one s and two p orbitals mix up with each other is called

Sp³-hybridization

Sp²-hybridization

Sp-hybridization

Dsp²-hybridization

11. A triple bond contains _____ sigma bond(s) and _________ pi bond(s).

1, 2

0, 3

3, 0

2, 1

12. Furan is a give membered ring in which one position is occupied by

-O-

H-N-

H-O-

None

13. Choose the molecule that is incorrectly matched with the electronic geometry about the central atom.

PF₃ - pyramidal

NH₃ - tetrahedral

H₂O – tetrahedral

CF₄ - tetrahedral

14. In C₂H₂ carbon-carbon bond angle is

120°

180°

109.5°

90°

15. Normal by product of cracking is

All of these

Ethane

Butane

Benzene

16. On passing ethane into concentrated sulphuric acid, the intermediate compound formed on hydrolysis with boiling water gives:

Ethyl alcohol

Ethyl hydrogen sulphate

Methyl alcohol

Methyl hydrogen sulphate

17. When H₂SO₄ is heated with excess of chance of at 140°C. The major product is

Ethene

Alcohol

Ether

Ketone

18. Which is a mixture of low boiling hydrocarbon

Graphite

Petroleum

Wood

Natural gas

19. Wholer prepared urea from

Uric acid

Ammonia

NH₄CNO

NH₃

20. Straight chain hydrocarbons are

None of these

In which atoms of C are in a series

Not in a series

In which each carbon is attached at least with three other carbon atoms

21. Which molecule has a linear arrangement of all component atoms?

CH₄

CO₂

NH₃

H₂O

22. Organic compounds are soluble in all except

Benzene

Ether

Petroleum

Water

23. No lead gasoline with hygher octane number can be obtained by

Cracking

Hydrogenation

Reforming process

Oxidation

24. Either show the phenomenon of

Functional group isomerism

Cis-trans isomerism

Metamerism

Position isomerism

25. Which is not the characteristic property of organic compounds?

Organic compounds are water soluble

They exist in homologous series

Organic compound chain compounds

They form long chain compounds

Page 2 of 5

26. Bromoethane can be converted to ethane by

Reaction with alcoholic KOH

Reduction

Reaction with aq KOH

Oxidation

27. The process in which orbitals of different energies and shapes mix up with each other to give equivalent orbitals is called

Isomerisation

Polymerization

Hybridization

Carbonization

28. Replacement of hydrogen atom by – SO₃H group in benzene is called

Alkylation

Acylation

Nitration

Sulphonation

29. A π (pi) bond is the result of the

Sidewise overlap of two parallel p orbitals

Overlap of two s orbitals

Overlap of two p orbitals along their axes

Overlap of an s and a p orbital

30. Peat before conversion to bituminous coal is converted to

Anthracite

None

Lignite

Asphalt

31. Organic compounds resemble to those of inorganic compounds having same

Carbon forming long chain or rings

Chemical forces

Ionic properties

Isomerism

32. Hydrocarbons contain

C and H only

C, H, and O only

C, H, O and N only

C and S only

33. Which polyatomic ion is incorrectly matched with its ionic geometry?

PH₄⁺ - tetrahedral

ClO₂ - angular

SiCl₆²¯ -trigonal bipyramidal

NH₄⁺ - tetrahedral

34. There is no direct test for the detection of one of the following is an organic compound. Which is it?

35. Cracking is a process by which higher hydrocarbon are broken down into low boiling hydrocarbon. Which one is not generally a procedure for cracking:

Normal cracking

Thermal cracking

Catalytic cracking

Stem cracking

36. The F-S-F bond angles in SF₆ are ___________.

120° only

90° and 120°

45° and 90°

90° and 180°

37. Which one has zero octane number?

iso – octane

n – Heptane

n – Hexane

decane

38. When a carbon atom forms single bonds with other carbon atoms, these hybrid orbitals overlap with the orbitals of hydrogen to form four bonds which are

Three sigma and one Pi

Sigma

One sigma and three Pi

Two sigma and two Pi

39. Reactions of 2 – Butene with HBr gives only one products because

It is more stable

The molecule is symmetrical around C – C

The molecule is asymmetrical around C – C bond

It is less stable

40. Hybridization explain the ________ of orbitals

Shape and Type of bonding

None of these

Shapes

Type of Bonding

41. Which one of the following is a heterocyclic compound?

Cyclohexanol

Anthracene

Pysidence

Phenol

42. The self-linking of carbon atoms is called

Chelation

Isomerism

Catenation

None of these

43. On passing ethane into concentrated suphuric acid the intermediate compound formed on hydrolysis with boiling water gives.

Methyl hydrogen sulphate

Ethyl alcohol

Ethyl hydrogen sulphate

Methyl alcohol

44. A neutral molecule having the general formula AB₃ has two unshared pair of electrons on A. What is the hybridization of A?

sp³d

sp³

sp²

45. Identify the hydrocarbon formed, when ethyl bromide reacts with, alcoholic KOH at 100°

Ethene

Ethane

Ethyne

Methane

46. Ethyl alcohol on ____________ gives ethane

Dehydrogenation

Dehydration

Oxidation

Hydration

47. Alkanes cannot show cis-trans isomerism

The bond angle is 109.5°

Alkanes possess three groups attached to each carbon

0¯ bond required less energy to be rotated

0¯ bond is stronger than A-bond

48. The components of petroleum can be separated due to

Having different physical states

Having different M.P.

Having different chemical properties

Having different B.P.

49. The essential component of organic compound is

50. What kind of hybrid orbitals are utilized by the carbon atom in CF₄ molecules?

sp³ d

sp²

sp³

Page 3 of 5

51. An isomer of ethanol is:

Dimethyl ether

Acetone

Diethyl ether

Methanol

52. Replacement of hydrogen atom by – SO₃H group in benzene is called

Alkylation

Acylation

Nitration

Sulphonation

53. The open chain organic compounds are called

Aromatic

Aliphatic

Linear compounds

Both A and B

54. Which of the following is complex?

CH₄

CaSO₄. 0.5H₂O

(C₆H₁₀O₅)n

C₆H₁₂O₆

55. Polythene is a polymer of

Ethene

Ethane

Acetone

Propylene

56. The isomers due to the unequal distribution of carbon atoms on either side of the functional group belonging to the same homologous series are called

Functional isomers

Chain isomers

Metamers

Position isomers

57. Pi bonds are produced by overlapping of

Hybrid and un hybrid orbitals

Atomic orbital and hybrid orbital

Un-hybrid orbitals

Hybrid orbitals

58. Which is the solid form of petroleum?

Asphalt

Peat

Naptha

Wood

59. Geometry of simple molecule having sp3 hybrid orbital is

Triangular

Square planner

Tetrahedral

Linear

60. Acetylene had a characteristic ethereal smell resembling that of

Onion

Vinegar

Ginger

Garlic

61. The characteristic reactions of alkanes are

Polymerization

Condensation reactions

Substitution reactions

Addition reactions

62. Identify the compound which has a bond angle of 109.5°?

Methane

Ethyne

Ethere

Benzene

63. In which molecule carbon atom is sp² hybridized

C₂H₂

None of these

CH₄

C₂H₄

64. A molecular orbital is formed by the linear combination of two atomic orbitals. A molecular orbital must accommodate __________ electrons.

65. Methane is produced when aluminum carbide is treated with

Alcohol

Base

Acid

Water

66. The state of hybridization carbon in ethane is

SP²

None

SP³

67. Which of the following has linear shape?

None of these

SP³

SP²

68. Which one is not an organic compound

None of these

Cyanides

Carbohydrates

Fats

69. On sp3 hybridization

One p-orbital is involved

Four p-orbitals are involved

One s and 3 p-orbitals are involved

All p-orbitals are involved

70. Unsaturated hydrocarbons containing a double bond are called

Olefins

Paraffin

Alkanes

Acetylene

71. The method of converting high boiling hydrocarbons into low boiling hydrocarbons is called

Isomerization

Condensation

Polymerization

Cracking

72. Vital force theory was rejected by

Kolbe

Lavoisier

Wholer

Berzelius

73. The use of tetra ethyl lead in petrol as an efficient antiknock agent is being discouraged. Which reason is correct?

It is costly

It damages the engine

Pb is difficult to obtain in bulk qualities

The combustion product, lead causes air pollution

74. Metallic ethynides are formed by the reaction of ________ with ammonical solver nitrate or ammonical cuprous chloride

Acetylene

Ethanoic acid

Benzene

Ethane

75. The number of isomers of C₆H₁₄ is:

Page 4 of 5

76. When a compound X is passed through a dilute alkaline solution of KMnO₄ the pink colour of solution is discharged. The compound X is possibly

Methane

Benzene

Ethene

Ethane

77. Which statement is true regarding reactivity?

Towards the addition reaction alkenes are more reactive than alkynes

Alkenes do not undergo addition reactions

Alkene decolourize bromine solution and Baeyer’s reagents but alkynes do not

Double and is stronger than single bond hence alkenes are less reactive than alkanes

78. Which of the following possess linear geometry

Alkene

Alkyne

Alkane

Benzene

79. The compounds which have any atom other than carbon atom, in rings are called as

Homocyclic

None of these

Monocyclic

Heterocyclic

80. Ether shows the phenomenon of

Chain isomerism

Metamerism

Cis – trass isomerism

Position isomerism

81. Which of the following compounds will exhibit cis-trans isomerism?

2-butanol

2-butene

2-butyne

Butanal

82. Linear shape is shown by which compound

CHCl₃

C₂H₆

C₂Cl₂

C₂H₂Cl₂

83. Coal is obtained from dead remains of

Plants

Animals

None

Both a and b

84. What hybridization is predicted for sulfur in the HSO₃¯ ion?

sp²

sp³d

sp³

85. Choose the species that is incorrectly matched with the electronic geometry about the central atom:

ClO₄¯ - tetrahedral

ClO₃¯-tetrahedral

SO₃²¯ - pyramidal

NO₂¯ - trigonal palnar

86. Which of the following pairs of molecules and their molecular geometries in WRONG?

BF₃ - trigonal planar

AsF₅ - trigonal bipyramidal

NF₃ - trigonal planar

H₂O - bent

87. In Pakistan, 80% available coal is used for which purpose

Sugar industry

Bake bricks

Domestic use

In glass industry

88. The rotation of two carbon atoms joined by double bond would happened only if

Pi bond is broken

None of these

Both bonds are broken

Sigma bond is broken

89. Compounds of carbon and hydrogen in which the tetra valency of carbon is fully satisfied are called:

Saturated

Magnetic

Un-saturated

Para-magnetic

90. Fossil fuels are sources of organic compounds. Which one is not fossil fuel?

Coal

Wood

Natural gas

Petroleum

91. Isomerism which is only found in alkanes?

Functional group isomerism

Position isomerism

Metamerism

cis – trans isomerism

92. Identify the4 compound formed, when ethylene combines with water in the presences of 10% sulphuric acid and HgSO₄ as catalyst

Carbinol

Methanol

Glycol

Ethanol

93. Coal heated in the absence of air of about 500-1000⁰C is converted to

Coke

Coal gas

All above

Coal tar

94. Which one of the following contains 50% carbon?

Antheracite

Wood

Peat

Coal tar

95. Geometry of molecule will be pyramidal if the outer post shell of the central atom has

2 band pair 2 lone pair

3 band pair one lone pair

3 lone pair 1 bond pair

1 band pair 3 lone pair

96. The demand of gasoline can be fulfilled by

Reforming

Vapourization

Crystallization

Cracking

97. I-Chloropropane has two isomers. It is an example of

Functional group isomerism

Chain isomerism

Metamerism

Position isomerism

98. The structure of benzene is

Tetrahedral

Square planer

Hexagonal

Pyramidal

99. The functional group isomer of dimethyl –ether is

Prophyl alcohol

Diethyl pether

Butyl alcohol

Ethyl alcohol

100. The active part in a molecule is called:

Chemical bonding

Homologous series

Ionic complex

Functional group

Page 5 of 5

101. Toulene is a compound in which benzene has a substituent

+NH₂ group

-CH₃ group

-CHO group

- OH group

102. The octane number is 100 for

Neo-Pentane

n-hexane

Isooctane

Neo-octane

103. The components of petroleum can be separated due to

Having different M.P.

Having different chemical properties

Having different B.P.

Having different physical states

104. C₄H₈ can show isomerism

Geometric

Functional group

Position

Structural

105. Which of the following contains single bonds?

Benzene

Alkyne

Alkane

Alkene

106. The next homologue of C₁₀H₂₂ will be

C₁₁H₂₄

C₁₂H₂₆

C₁₃H₂₈

C₉H₂₀

107. Which is the character of organic compounds

All

Rates of reactions are very fast

They possess particular properties

Mostly ionic in character

108. The perchloric acid molecule contains:

13 lone pairs, 1 π bond, and 4 σ bonds

2 lone pairs, 3 π bonds, and 4 σ bonds.

8 lone pairs, 2 π bonds, and 7 σ bonds.

9 lone pairs, no π bonds, and 6 σ bonds.

109. The bond angle between hydrogen atoms and carbon in alkane is

109.5°

120.5°

104.5°

107.5°

110. Compounds have same empirical formula but different molecular formula must have

Different molecular weights

The same viscosity

Same molecular weights

The same vapour density

111. Rates of organic reactions are

Fast

Very fast

None-reactive

Slow

112. Which of the following species is planar?

NH₃

H₃O⁺

SO₃²¯

NO₃¯

113. Acetylene has a characteristic ethereal smell resembling that of:

Garlic

Ginger

Vinegar

Onion

114. In benzene carbon – carbon bonds are

Single covalent

Double covalent

3 single and 3 double

Of the order 1.5

115. Which of the following compounds contains a truple bond?

Alkane

Alkyne

Benzene

Alkene

116. Which of the following four molecules are polar: PH₃ OF₂ HF SO₃?

Only HF and OF₂

Only HF

All except SO₃

None of these

117. C₂H₂Cl₂ can show isomerism

Functional group

Position

Metamerism

Geometric

118. The major portion of natural oil is

Butane

Propane

Methane

Ethane

119. The carbocyclic compounds are those which have

All atoms are SP² -hybridized

May be other atoms

All atoms in the ring are carbon

All atoms are SP³ -hybridized

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Malik TahirLast Updated: October 14, 2025

10 Comments

Misbah Komal says:

March 14, 2023 at 1:10 am

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Misbah Komal says:

March 14, 2023 at 1:09 am

I learnt a good knowledge from it

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February 25, 2023 at 11:05 pm

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Mian rouf Sajjad says:

September 28, 2021 at 5:59 pm

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Mian rouf Sajjad says:

September 28, 2021 at 5:58 pm

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Ariba jaffar says:

June 13, 2021 at 1:36 pm

It’s good to solve these McQ’s but there must be some more conceptual and technical points in them like there a lot of conceptual McQ’s about isomerism..

Haniya Khan says:

September 15, 2017 at 10:47 pm

yes 100%

1. Injeel Khan says:
  
  May 12, 2022 at 10:09 pm
  
  What do you mean 100%
  
2. Naeem Asghar says:
  
  May 26, 2022 at 10:08 am
  
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nimra ishfaq says:

August 21, 2016 at 2:57 pm

yes! 100%

Fundamental Principles of Organic Chemistry Online Mcqs Test

Important Fundamental Principles of Organic Question and Answer

Chemistry Fundamental Principles of Organic Practice Test Online With Explanation

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