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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:

Diethyl ether

Methanol

Dimethyl ether

Acetone

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

None of these

Homocyclic

Monocyclic

Heterocyclic

3. Vital force theory was rejected by

Wholer

Kolbe

Lavoisier

Berzelius

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

Glycol

Methanol

Carbinol

Ethanol

5. Ethyl alcohol on ____________ gives ethane

Hydration

Dehydrogenation

Oxidation

Dehydration

6. The characteristic reactions of alkanes are

Polymerization

Condensation reactions

Addition reactions

Substitution reactions

7. The demand of gasoline can be fulfilled by

Crystallization

Vapourization

Cracking

Reforming

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

3 lone pair 1 bond pair

2 band pair 2 lone pair

1 band pair 3 lone pair

3 band pair one lone pair

9. The number of isomers of C₆H₁₄ is:

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

NH₃ - tetrahedral

PF₃ - pyramidal

H₂O – tetrahedral

CF₄ - tetrahedral

11. Geometry of simple molecule having sp3 hybrid orbital is

Linear

Triangular

Square planner

Tetrahedral

12. Wholer prepared urea from

NH₄CNO

Ammonia

Uric acid

NH₃

13. Ether shows the phenomenon of

Cis – trass isomerism

Chain isomerism

Metamerism

Position isomerism

14. C₂H₂Cl₂ can show isomerism

Geometric

Functional group

Metamerism

Position

15. C₄H₈ can show isomerism

Functional group

Position

Geometric

Structural

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

Bake bricks

Domestic use

Sugar industry

In glass industry

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

Sp²-hybridization

Sp³-hybridization

Dsp²-hybridization

Sp-hybridization

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

Acylation

Nitration

Sulphonation

Alkylation

19. Which molecule is nonpolar?

CHCl₃

H₂Se

BeH₂

PF₃

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

None of these

Pi bond is broken

Sigma bond is broken

Both bonds are broken

21. Unsaturated hydrocarbons containing a double bond are called

Alkanes

Acetylene

Olefins

Paraffin

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

Ether

Alcohol

Ketone

Ethene

23. Which one has zero octane number?

n – Heptane

n – Hexane

decane

iso – octane

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

ClO₃¯-tetrahedral

ClO₄¯ - tetrahedral

NO₂¯ - trigonal palnar

SO₃²¯ - pyramidal

25. The major portion of natural oil is

Butane

Propane

Methane

Ethane

Page 2 of 5

26. Which is a mixture of low boiling hydrocarbon

Natural gas

Graphite

Wood

Petroleum

27. Hybridization explain the ________ of orbitals

Type of Bonding

Shapes

None of these

Shape and Type of bonding

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

Vinegar

Ginger

Onion

Garlic

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

Conformers

Diastereomers

Enantiomers

Positional isomers

30. Methane is produced when aluminum carbide is treated with

Water

Alcohol

Acid

Base

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

sp³

sp²

sp³d

32. Petroleum is mainly a mixture of

Saturated hydrocarbons

Phenols

Unsaturated hydrocarbon

Compounds of S

33. Normal by product of cracking is

All of these

Ethane

Benzene

Butane

34. Bromoethane can be converted to ethane by

Reaction with alcoholic KOH

Reaction with aq KOH

Reduction

Oxidation

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

-CH₃ group

-CHO group

+NH₂ group

- OH group

36. Which of the following has linear shape?

SP²

SP³

None of these

37. Rates of organic reactions are

None-reactive

Fast

Very fast

Slow

38. In which molecule carbon atom is sp² hybridized

None of these

C₂H₂

CH₄

C₂H₄

39. The essential component of organic compound is

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

Butanal

2-butanol

2-butene

2-butyne

41. 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

Thermal cracking

Stem cracking

42. Which of the following possess linear geometry

Alkene

Benzene

Alkane

Alkyne

43. The next homologue of C₁₀H₂₂ will be

C₁₂H₂₆

C₁₁H₂₄

C₉H₂₀

C₁₃H₂₈

44. 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

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

90° and 180°

90° and 120°

45° and 90°

120° only

46. Which is the character of organic compounds

All

Mostly ionic in character

They possess particular properties

Rates of reactions are very fast

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

1, 2

2, 1

3, 0

0, 3

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

Benzene

Methane

Ethere

Ethyne

49. Linear shape is shown by which compound

C₂H₆

C₂H₂Cl₂

CHCl₃

C₂Cl₂

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

H₂O

CH₄

CO₂

NH₃

Page 3 of 5

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

H-O-

-O-

None

H-N-

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

Alcohols

Hydrogen sulphides

Thiols

Sulphides

53. Peat before conversion to bituminous coal is converted to

Lignite

Asphalt

None

Anthracite

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

Coal tar

Wood

Peat

Antheracite

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

56. Pi bonds are produced by overlapping of

Hybrid orbitals

Un-hybrid orbitals

Atomic orbital and hybrid orbital

Hybrid and un hybrid orbitals

57. The structure of benzene is

Hexagonal

Square planer

Pyramidal

Tetrahedral

58. In C₂H₂ carbon-carbon bond angle is

120°

180°

90°

109.5°

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

Ethyl hydrogen sulphate

Methyl hydrogen sulphate

Ethyl alcohol

Methyl alcohol

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

Ionic properties

Carbon forming long chain or rings

Chemical forces

Isomerism

61. Which of the following is complex?

CH₄

C₆H₁₂O₆

(C₆H₁₀O₅)n

CaSO₄. 0.5H₂O

62. The self-linking of carbon atoms is called

None of these

Chelation

Isomerism

Catenation

63. 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

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

Organic compounds are water soluble

They form long chain compounds

Organic compound chain compounds

They exist in homologous series

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

Nitration

Acylation

Alkylation

Sulphonation

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

107.5°

104.5°

109.5°

120.5°

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

Chain isomerism

Metamerism

Functional group isomerism

Position isomerism

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

Pysidence

Phenol

Cyclohexanol

Anthracene

69. In catalytic cracking, the typical catalyst used is

Al₂O₃

SiO₂+Al₂O₃

SiO₂

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

Benzene

Ethanoic acid

Acetylene

Ethane

71. In benzene carbon – carbon bonds are

Single covalent

Double covalent

3 single and 3 double

Of the order 1.5

72. The active part in a molecule is called:

Functional group

Ionic complex

Homologous series

Chemical bonding

73. Polythene is a polymer of

Acetone

Ethane

Ethene

Propylene

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

Alkyne

Alkane

Benzene

Alkene

75. 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

Page 4 of 5

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

Methyl alcohol

Ethyl hydrogen sulphate

Ethyl alcohol

Methyl hydrogen sulphate

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

sp³

sp²

sp³ d

78. Either show the phenomenon of

Cis-trans isomerism

Metamerism

Functional group isomerism

Position isomerism

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

Reforming process

Oxidation

Hydrogenation

Cracking

80. 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

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

Magnetic

Un-saturated

Para-magnetic

Saturated

82. Isomerism which is only found in alkanes?

Metamerism

cis – trans isomerism

Position isomerism

Functional group isomerism

83. The carbocyclic compounds are those which have

All atoms are SP² -hybridized

All atoms in the ring are carbon

All atoms are SP³ -hybridized

May be other atoms

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

Glucose

Ammonium cyanate

Methane

Urea

85. The functional group isomer of dimethyl –ether is

Prophyl alcohol

Diethyl pether

Butyl alcohol

Ethyl alcohol

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

Coke

Coal tar

All above

Coal gas

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

Ethane

Butane

Methane

Propane

88. The components of petroleum can be separated due to

Having different M.P.

Having different physical states

Having different B.P.

Having different chemical properties

89. On sp3 hybridization

One s and 3 p-orbitals are involved

One p-orbital is involved

Four p-orbitals are involved

All p-orbitals are involved

90. The open chain organic compounds are called

Aliphatic

Both A and B

Linear compounds

Aromatic

91. Alkanes cannot show cis-trans isomerism

The bond angle is 109.5°

0¯ bond is stronger than A-bond

0¯ bond required less energy to be rotated

Alkanes possess three groups attached to each carbon

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

The molecule is asymmetrical around C – C bond

It is less stable

The molecule is symmetrical around C – C

It is more stable

93. The components of petroleum can be separated due to

Having different chemical properties

Having different physical states

Having different M.P.

Having different B.P.

94. 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

Benzene

Methane

Ethene

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

Only HF

Only HF and OF₂

None of these

All except SO₃

96. The state of hybridization carbon in ethane is

SP³

SP²

None

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

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

AsF₅ - trigonal bipyramidal

H₂O - bent

BF₃ - trigonal planar

NF₃ - trigonal planar

99. Hydrocarbons contain

C and S only

C, H, O and N only

C and H only

C, H, and O only

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

Page 5 of 5

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

Wood

Natural gas

Coal

Petroleum

102. Which of the following species is planar?

NO₃¯

SO₃²¯

H₃O⁺

NH₃

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

SiCl₆²¯ -trigonal bipyramidal

PH₄⁺ - tetrahedral

ClO₂ - angular

NH₄⁺ - tetrahedral

104. Which of the following contains single bonds?

Alkyne

Alkane

Benzene

Alkene

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

sp³

sp³d

sp²

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

Ethene

Ethyne

Methane

Ethane

107. Coal is obtained from dead remains of

None

Plants

Animals

Both a and b

108. Acetylene had a characteristic ethereal smell resembling that of

Ginger

Onion

Vinegar

Garlic

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

Hexagon

Tetrahedron

Cube

Pentagon

110. Which one is not an organic compound

None of these

Cyanides

Carbohydrates

Fats

111. Which is the solid form of petroleum?

Wood

Asphalt

Peat

Naptha

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

Condensation

Isomerization

Polymerization

Cracking

113. The octane number is 100 for

Neo-Pentane

Neo-octane

n-hexane

Isooctane

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

The same vapour density

The same viscosity

Same molecular weights

Different molecular weights

115. The perchloric acid molecule contains:

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

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

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

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

116. 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

117. 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

One sigma and three Pi

Two sigma and two Pi

Sigma

118. 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

119. Organic compounds are soluble in all except

Ether

Benzene

Water

Petroleum

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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

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February 25, 2023 at 11:05 pm

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September 28, 2021 at 5:59 pm

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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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