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

3 band pair one lone pair

2 band pair 2 lone pair

3 lone pair 1 bond pair

1 band pair 3 lone pair

2. Normal by product of cracking is

Benzene

Butane

Ethane

All of these

3. Methane is produced when aluminum carbide is treated with

Base

Alcohol

Water

Acid

4. The active part in a molecule is called:

Homologous series

Chemical bonding

Ionic complex

Functional group

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

Carbonization

Polymerization

Hybridization

Isomerisation

6. Polythene is a polymer of

Ethene

Acetone

Ethane

Propylene

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

Only HF and OF₂

Only HF

All except SO₃

None of these

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

Butanal

2-butene

2-butanol

2-butyne

9. The state of hybridization carbon in ethane is

None

SP³

SP²

10. Peat before conversion to bituminous coal is converted to

Asphalt

Lignite

None

Anthracite

11. In which molecule carbon atom is sp² hybridized

CH₄

C₂H₄

None of these

C₂H₂

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

Alkylation

Acylation

Sulphonation

Nitration

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

Isomerization

Cracking

Condensation

Polymerization

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

They exist in homologous series

Organic compound chain compounds

Organic compounds are water soluble

They form long chain compounds

15. Which of the following contains single bonds?

Alkyne

Alkane

Benzene

Alkene

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

Alkane

Alkyne

Benzene

Alkene

17. Which one has zero octane number?

iso – octane

n – Heptane

decane

n – Hexane

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

Hexagon

Cube

Tetrahedron

Pentagon

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

20. C₄H₈ can show isomerism

Functional group

Geometric

Position

Structural

21. Which one is not an organic compound

Fats

Cyanides

Carbohydrates

None of these

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

NH₃

CO₂

H₂O

CH₄

23. Either show the phenomenon of

Functional group isomerism

Metamerism

Cis-trans isomerism

Position isomerism

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

Petroleum

Natural gas

Coal

Wood

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

Ethene

Ether

Alcohol

Ketone

Page 2 of 5

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

H-O-

None

H-N-

-O-

27. Straight chain hydrocarbons are

Not in a series

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

In which atoms of C are in a series

None of these

28. Alkanes cannot show cis-trans isomerism

0¯ bond is stronger than A-bond

The bond angle is 109.5°

Alkanes possess three groups attached to each carbon

0¯ bond required less energy to be rotated

29. Petroleum is mainly a mixture of

Unsaturated hydrocarbon

Compounds of S

Phenols

Saturated hydrocarbons

30. The self-linking of carbon atoms is called

Catenation

Chelation

None of these

Isomerism

31. Rates of organic reactions are

None-reactive

Very fast

Slow

Fast

32. Wholer prepared urea from

NH₄CNO

NH₃

Ammonia

Uric acid

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

Metamerism

Functional group isomerism

Chain isomerism

Position isomerism

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

Ethyl hydrogen sulphate

Ethyl alcohol

Methyl hydrogen sulphate

Methyl alcohol

35. On sp3 hybridization

All p-orbitals are involved

One s and 3 p-orbitals are involved

One p-orbital is involved

Four p-orbitals are involved

36. The carbocyclic compounds are those which have

All atoms are SP³ -hybridized

All atoms are SP² -hybridized

May be other atoms

All atoms in the ring are carbon

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

109.5°

107.5°

120.5°

104.5°

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

3, 0

2, 1

1, 2

0, 3

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

Chemical forces

Ionic properties

Carbon forming long chain or rings

Isomerism

40. The number of isomers of C₆H₁₄ is:

41. Hybridization explain the ________ of orbitals

None of these

Type of Bonding

Shapes

Shape and Type of bonding

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

ClO₃¯-tetrahedral

NO₂¯ - trigonal palnar

SO₃²¯ - pyramidal

ClO₄¯ - tetrahedral

43. Ether shows the phenomenon of

Chain isomerism

Position isomerism

Cis – trass isomerism

Metamerism

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

NH₄⁺ - tetrahedral

PH₄⁺ - tetrahedral

ClO₂ - angular

SiCl₆²¯ -trigonal bipyramidal

45. Which of the following species is planar?

NO₃¯

H₃O⁺

NH₃

SO₃²¯

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

Coal gas

All above

Coal tar

Coke

47. Which of the following is complex?

CaSO₄. 0.5H₂O

CH₄

C₆H₁₂O₆

(C₆H₁₀O₅)n

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

Ethyl hydrogen sulphate

Ethyl alcohol

Methyl alcohol

Methyl hydrogen sulphate

49. In catalytic cracking, the typical catalyst used is

SiO₂

SiO₂+Al₂O₃

Al₂O₃

50. Which is the solid form of petroleum?

Wood

Naptha

Peat

Asphalt

Page 3 of 5

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

Ethane

Acetylene

Ethanoic acid

Benzene

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

-CH₃ group

- OH group

-CHO group

+NH₂ group

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

Nitration

Alkylation

Acylation

Sulphonation

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

Alcohols

Thiols

Hydrogen sulphides

Sulphides

55. An isomer of ethanol is:

Acetone

Dimethyl ether

Methanol

Diethyl ether

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

Un-saturated

Magnetic

Saturated

Para-magnetic

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

Methane

Ammonium cyanate

Glucose

Urea

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

Pi bond is broken

Sigma bond is broken

Both bonds are broken

None of these

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

Peat

Antheracite

Wood

Coal tar

60. Organic compounds are soluble in all except

Benzene

Ether

Petroleum

Water

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

Garlic

Onion

Vinegar

Ginger

62. The major portion of natural oil is

Methane

Ethane

Propane

Butane

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

Methanol

Ethanol

Glycol

Carbinol

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

Cyclohexanol

Pysidence

Anthracene

Phenol

65. Which is a mixture of low boiling hydrocarbon

Wood

Natural gas

Petroleum

Graphite

66. The structure of benzene is

Tetrahedral

Square planer

Pyramidal

Hexagonal

67. 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

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

The molecule is symmetrical around C – C

The molecule is asymmetrical around C – C bond

It is more stable

It is less stable

69. The perchloric acid molecule contains:

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

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

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

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

70. Which statement is true regarding reactivity?

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

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

Alkenes do not undergo addition reactions

Towards the addition reaction alkenes are more reactive than alkynes

71. Linear shape is shown by which compound

CHCl₃

C₂H₆

C₂Cl₂

C₂H₂Cl₂

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

Sp-hybridization

Dsp²-hybridization

Sp²-hybridization

Sp³-hybridization

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

Stem cracking

Catalytic cracking

Normal cracking

Thermal cracking

74. 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

Ethene

Ethane

Methane

Benzene

75. The characteristic reactions of alkanes are

Polymerization

Addition reactions

Substitution reactions

Condensation reactions

Page 4 of 5

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

H₂O – tetrahedral

CF₄ - tetrahedral

NH₃ - tetrahedral

PF₃ - pyramidal

77. Acetylene had a characteristic ethereal smell resembling that of

Garlic

Onion

Vinegar

Ginger

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

Overlap of an s and a p orbital

Overlap of two s orbitals

Overlap of two p orbitals along their axes

Sidewise overlap of two parallel p orbitals

79. 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

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

sp³d

sp³

sp²

81. Pi bonds are produced by overlapping of

Hybrid orbitals

Hybrid and un hybrid orbitals

Un-hybrid orbitals

Atomic orbital and hybrid orbital

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

Conformers

Positional isomers

Diastereomers

Enantiomers

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

Reforming process

Oxidation

Hydrogenation

Cracking

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

The same viscosity

Same molecular weights

The same vapour density

Different molecular weights

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

Domestic use

Sugar industry

In glass industry

Bake bricks

86. Hydrocarbons contain

C and S only

C and H only

C, H, O and N only

C, H, and O only

87. The components of petroleum can be separated due to

Having different physical states

Having different B.P.

Having different M.P.

Having different chemical properties

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

89. Geometry of simple molecule having sp3 hybrid orbital is

Linear

Triangular

Tetrahedral

Square planner

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

sp³

sp²

sp³ d

91. 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.

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

sp²

sp³d

sp³

93. In C₂H₂ carbon-carbon bond angle is

90°

180°

120°

109.5°

94. The essential component of organic compound is

95. Vital force theory was rejected by

Lavoisier

Wholer

Kolbe

Berzelius

96. 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

Three sigma and one Pi

Two sigma and two Pi

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

H₂O - bent

NF₃ - trigonal planar

AsF₅ - trigonal bipyramidal

BF₃ - trigonal planar

98. Which is the character of organic compounds

Mostly ionic in character

Rates of reactions are very fast

All

They possess particular properties

99. The functional group isomer of dimethyl –ether is

Diethyl pether

Ethyl alcohol

Prophyl alcohol

Butyl alcohol

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

Ethene

Methane

Ethane

Ethyne

Page 5 of 5

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

Ethere

Methane

Benzene

Ethyne

102. C₂H₂Cl₂ can show isomerism

Geometric

Position

Functional group

Metamerism

103. The next homologue of C₁₀H₂₂ will be

C₁₃H₂₈

C₁₁H₂₄

C₉H₂₀

C₁₂H₂₆

104. The octane number is 100 for

Neo-Pentane

Isooctane

Neo-octane

n-hexane

105. Isomerism which is only found in alkanes?

Position isomerism

cis – trans isomerism

Metamerism

Functional group isomerism

106. Which of the following possess linear geometry

Benzene

Alkene

Alkane

Alkyne

107. Ethyl alcohol on ____________ gives ethane

Dehydrogenation

Dehydration

Hydration

Oxidation

108. Unsaturated hydrocarbons containing a double bond are called

Acetylene

Olefins

Paraffin

Alkanes

109. Coal is obtained from dead remains of

None

Animals

Plants

Both a and b

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

90° and 120°

120° only

90° and 180°

45° and 90°

111. In benzene carbon – carbon bonds are

Single covalent

3 single and 3 double

Of the order 1.5

Double covalent

112. The demand of gasoline can be fulfilled by

Reforming

Cracking

Vapourization

Crystallization

113. Bromoethane can be converted to ethane by

Reduction

Reaction with alcoholic KOH

Oxidation

Reaction with aq KOH

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

Methane

Ethane

Butane

Propane

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

Homocyclic

None of these

Monocyclic

Heterocyclic

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

117. Which of the following has linear shape?

SP²

SP³

None of these

118. The open chain organic compounds are called

Aliphatic

Aromatic

Both A and B

Linear compounds

119. Which molecule is nonpolar?

CHCl₃

H₂Se

BeH₂

PF₃

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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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