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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. An isomer of ethanol is:

Dimethyl ether

Methanol

Diethyl ether

Acetone

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

Wood

Peat

Coal tar

Antheracite

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

NO₂¯ - trigonal palnar

SO₃²¯ - pyramidal

ClO₃¯-tetrahedral

ClO₄¯ - tetrahedral

4. In catalytic cracking, the typical catalyst used is

SiO₂+Al₂O₃

Al₂O₃

SiO₂

5. Which of the following has linear shape?

None of these

SP²

SP³

6. The next homologue of C₁₀H₂₂ will be

C₁₂H₂₆

C₉H₂₀

C₁₁H₂₄

C₁₃H₂₈

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

Domestic use

Sugar industry

Bake bricks

In glass industry

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

Vinegar

Ginger

Garlic

Onion

9. Which is the solid form of petroleum?

Peat

Wood

Naptha

Asphalt

10. Which of the following possess linear geometry

Benzene

Alkyne

Alkane

Alkene

11. Hydrocarbons contain

C and S only

C, H, O and N only

C, H, and O only

C and H only

12. The number of isomers of C₆H₁₄ is:

13. Isomerism which is only found in alkanes?

cis – trans isomerism

Functional group isomerism

Metamerism

Position isomerism

14. Organic compounds are soluble in all except

Ether

Water

Benzene

Petroleum

15. Hybridization explain the ________ of orbitals

None of these

Shape and Type of bonding

Shapes

Type of Bonding

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

Cyclohexanol

Anthracene

Phenol

Pysidence

17. 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

18. C₄H₈ can show isomerism

Structural

Geometric

Functional group

Position

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

Sulphonation

Nitration

Alkylation

Acylation

20. Which molecule is nonpolar?

BeH₂

PF₃

CHCl₃

H₂Se

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

Wood

Natural gas

Petroleum

Coal

22. Coal is obtained from dead remains of

Both a and b

Plants

None

Animals

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

Ethane

Ethyne

Methane

Ethene

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

Magnetic

Para-magnetic

Saturated

Un-saturated

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

- OH group

-CHO group

+NH₂ group

-CH₃ group

Page 2 of 5

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

They form long chain compounds

They exist in homologous series

Organic compound chain compounds

Organic compounds are water soluble

27. The perchloric acid molecule contains:

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

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

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

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

28. The essential component of organic compound is

29. Ether shows the phenomenon of

Metamerism

Position isomerism

Cis – trass isomerism

Chain isomerism

30. In which molecule carbon atom is sp² hybridized

C₂H₂

C₂H₄

CH₄

None of these

31. Polythene is a polymer of

Ethane

Acetone

Ethene

Propylene

32. Straight chain hydrocarbons are

Not in a series

In which atoms of C are in a series

None of these

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

33. On sp3 hybridization

One p-orbital is involved

Four p-orbitals are involved

All p-orbitals are involved

One s and 3 p-orbitals are involved

34. The state of hybridization carbon in ethane is

None

SP²

SP³

35. Ethyl alcohol on ____________ gives ethane

Dehydrogenation

Oxidation

Hydration

Dehydration

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

sp³

sp²

sp³ d

37. Which is a mixture of low boiling hydrocarbon

Graphite

Wood

Natural gas

Petroleum

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

NF₃ - trigonal planar

BF₃ - trigonal planar

H₂O - bent

AsF₅ - trigonal bipyramidal

39. Alkanes cannot show cis-trans isomerism

Alkanes possess three groups attached to each carbon

The bond angle is 109.5°

0¯ bond is stronger than A-bond

0¯ bond required less energy to be rotated

40. Which one has zero octane number?

iso – octane

n – Heptane

decane

n – Hexane

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

Methyl hydrogen sulphate

Methyl alcohol

Ethyl alcohol

Ethyl hydrogen sulphate

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

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

Methane

Ethere

Ethyne

Benzene

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

Benzene

Acetylene

Ethane

Ethanoic acid

45. Geometry of simple molecule having sp3 hybrid orbital is

Triangular

Linear

Square planner

Tetrahedral

46. The octane number is 100 for

Neo-Pentane

Isooctane

Neo-octane

n-hexane

47. Petroleum is mainly a mixture of

Phenols

Compounds of S

Unsaturated hydrocarbon

Saturated hydrocarbons

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

The molecule is symmetrical around C – C

It is less stable

The molecule is asymmetrical around C – C bond

It is more stable

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

Isomerization

Polymerization

Cracking

Condensation

50. Which of the following contains single bonds?

Benzene

Alkyne

Alkane

Alkene

Page 3 of 5

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

120° only

90° and 180°

90° and 120°

45° and 90°

52. Which statement is true regarding reactivity?

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

Towards the addition reaction alkenes are more reactive than alkynes

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

Alkenes do not undergo addition reactions

53. The characteristic reactions of alkanes are

Addition reactions

Polymerization

Substitution reactions

Condensation reactions

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

Pentagon

Hexagon

Cube

Tetrahedron

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

Methyl alcohol

Methyl hydrogen sulphate

Ethyl alcohol

Ethyl hydrogen sulphate

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

Alcohols

Hydrogen sulphides

Sulphides

Thiols

57. The components of petroleum can be separated due to

Having different chemical properties

Having different M.P.

Having different B.P.

Having different physical states

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

Ionic properties

Chemical forces

Carbon forming long chain or rings

Isomerism

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

It damages the engine

Pb is difficult to obtain in bulk qualities

It is costly

The combustion product, lead causes air pollution

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

Only HF

Only HF and OF₂

All except SO₃

None of these

61. In C₂H₂ carbon-carbon bond angle is

90°

109.5°

120°

180°

62. C₂H₂Cl₂ can show isomerism

Functional group

Metamerism

Position

Geometric

63. 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

Ethane

Methane

Ethene

Benzene

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

Functional group isomerism

Chain isomerism

Position isomerism

Metamerism

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

PF₃ - pyramidal

CF₄ - tetrahedral

H₂O – tetrahedral

NH₃ - tetrahedral

66. The demand of gasoline can be fulfilled by

Vapourization

Crystallization

Reforming

Cracking

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

2-butyne

2-butanol

Butanal

2-butene

68. Which of the following is complex?

CH₄

CaSO₄. 0.5H₂O

(C₆H₁₀O₅)n

C₆H₁₂O₆

69. The functional group isomer of dimethyl –ether is

Ethyl alcohol

Diethyl pether

Butyl alcohol

Prophyl alcohol

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

SiCl₆²¯ -trigonal bipyramidal

NH₄⁺ - tetrahedral

PH₄⁺ - tetrahedral

ClO₂ - angular

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

Ethane

Propane

Butane

Methane

72. Pi bonds are produced by overlapping of

Un-hybrid orbitals

Hybrid and un hybrid orbitals

Hybrid orbitals

Atomic orbital and hybrid orbital

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

Polymerization

Hybridization

Carbonization

Isomerisation

74. The self-linking of carbon atoms is called

None of these

Isomerism

Catenation

Chelation

75. Which one is not an organic compound

Carbohydrates

None of these

Fats

Cyanides

Page 4 of 5

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

Carbinol

Ethanol

Methanol

Glycol

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

78. Unsaturated hydrocarbons containing a double bond are called

Olefins

Alkanes

Acetylene

Paraffin

79. Peat before conversion to bituminous coal is converted to

Anthracite

None

Lignite

Asphalt

80. Methane is produced when aluminum carbide is treated with

Water

Base

Alcohol

Acid

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

Heterocyclic

None of these

Monocyclic

Homocyclic

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

Cracking

Hydrogenation

Reforming process

Oxidation

83. The major portion of natural oil is

Propane

Methane

Butane

Ethane

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

CH₄

H₂O

NH₃

CO₂

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

None

H-O-

-O-

H-N-

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

Overlap of two p orbitals along their axes

Overlap of two s orbitals

Sidewise overlap of two parallel p orbitals

Overlap of an s and a p orbital

87. Linear shape is shown by which compound

C₂H₂Cl₂

C₂H₆

CHCl₃

C₂Cl₂

88. Normal by product of cracking is

All of these

Ethane

Butane

Benzene

89. 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

Catalytic cracking

Stem cracking

Thermal cracking

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

sp³d

sp³

sp²

91. In benzene carbon – carbon bonds are

Double covalent

Of the order 1.5

3 single and 3 double

Single covalent

92. The open chain organic compounds are called

Both A and B

Linear compounds

Aromatic

Aliphatic

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

Glucose

Ammonium cyanate

Methane

Urea

94. Vital force theory was rejected by

Berzelius

Wholer

Kolbe

Lavoisier

95. Rates of organic reactions are

Very fast

None-reactive

Fast

Slow

96. Which of the following species is planar?

H₃O⁺

SO₃²¯

NH₃

NO₃¯

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

Coal gas

Coal tar

Coke

All above

98. Acetylene had a characteristic ethereal smell resembling that of

Vinegar

Onion

Ginger

Garlic

99. 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

One sigma and three Pi

Sigma

Two sigma and two Pi

Three sigma and one Pi

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

Alkene

Alkyne

Alkane

Benzene

Page 5 of 5

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

Conformers

Enantiomers

Diastereomers

Positional isomers

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

Sigma bond is broken

None of these

Both bonds are broken

Pi bond is broken

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

Sp³-hybridization

Sp²-hybridization

Dsp²-hybridization

Sp-hybridization

104. 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

Metamers

Chain isomers

Position isomers

Functional isomers

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

109.5°

107.5°

120.5°

104.5°

106. The structure of benzene is

Hexagonal

Square planer

Tetrahedral

Pyramidal

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

Same molecular weights

Different molecular weights

The same vapour density

The same viscosity

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

3, 0

1, 2

2, 1

0, 3

109. The carbocyclic compounds are those which have

All atoms in the ring are carbon

All atoms are SP³ -hybridized

All atoms are SP² -hybridized

May be other atoms

110. Either show the phenomenon of

Cis-trans isomerism

Position isomerism

Functional group isomerism

Metamerism

111. The active part in a molecule is called:

Functional group

Homologous series

Ionic complex

Chemical bonding

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

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

Alcohol

Ketone

Ethene

Ether

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

3 band pair one lone pair

1 band pair 3 lone pair

3 lone pair 1 bond pair

2 band pair 2 lone pair

115. Wholer prepared urea from

Uric acid

NH₄CNO

Ammonia

NH₃

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

Sulphonation

Alkylation

Nitration

Acylation

117. Which is the character of organic compounds

Rates of reactions are very fast

Mostly ionic in character

All

They possess particular properties

118. Bromoethane can be converted to ethane by

Reaction with aq KOH

Reaction with alcoholic KOH

Oxidation

Reduction

119. The components of petroleum can be separated due to

Having different M.P.

Having different B.P.

Having different physical states

Having different chemical properties

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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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