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

All above

Coal tar

Coke

Coal gas

2. The octane number is 100 for

n-hexane

Neo-octane

Neo-Pentane

Isooctane

3. C₂H₂Cl₂ can show isomerism

Geometric

Position

Functional group

Metamerism

4. The structure of benzene is

Square planer

Hexagonal

Pyramidal

Tetrahedral

5. A π (pi) bond is the result of the

Overlap of an s and a p orbital

Overlap of two p orbitals along their axes

Overlap of two s orbitals

Sidewise overlap of two parallel p orbitals

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

Ethane

Ethanoic acid

Acetylene

Benzene

7. The functional group isomer of dimethyl –ether is

Butyl alcohol

Diethyl pether

Ethyl alcohol

Prophyl alcohol

8. In C₂H₂ carbon-carbon bond angle is

90°

109.5°

180°

120°

9. Which of the following contains single bonds?

Alkane

Alkyne

Benzene

Alkene

10. The active part in a molecule is called:

Functional group

Homologous series

Ionic complex

Chemical bonding

11. In which molecule carbon atom is sp² hybridized

None of these

C₂H₂

C₂H₄

CH₄

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

13. Acetylene had a characteristic ethereal smell resembling that of

Ginger

Vinegar

Onion

Garlic

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

Ethanol

Methanol

Carbinol

Glycol

15. Either show the phenomenon of

Position isomerism

Cis-trans isomerism

Metamerism

Functional group isomerism

16. Which of the following is complex?

CH₄

CaSO₄. 0.5H₂O

(C₆H₁₀O₅)n

C₆H₁₂O₆

17. Pi bonds are produced by overlapping of

Hybrid orbitals

Hybrid and un hybrid orbitals

Atomic orbital and hybrid orbital

Un-hybrid orbitals

18. Hydrocarbons contain

C and H only

C, H, and O only

C, H, O and N only

C and S only

19. The self-linking of carbon atoms is called

Catenation

Isomerism

None of these

Chelation

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

ClO₄¯ - tetrahedral

NO₂¯ - trigonal palnar

SO₃²¯ - pyramidal

ClO₃¯-tetrahedral

21. Normal by product of cracking is

Benzene

Ethane

Butane

All of these

22. Which is the solid form of petroleum?

Naptha

Asphalt

Peat

Wood

23. Petroleum is mainly a mixture of

Unsaturated hydrocarbon

Phenols

Compounds of S

Saturated hydrocarbons

24. Which one is not an organic compound

Cyanides

Fats

Carbohydrates

None of these

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

Garlic

Ginger

Vinegar

Onion

Page 2 of 5

26. Straight chain hydrocarbons are

None of these

Not in a series

In which atoms of C are in a series

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

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

None of these

Heterocyclic

Homocyclic

Monocyclic

28. The essential component of organic compound is

29. Which of the following possess linear geometry

Alkyne

Alkane

Alkene

Benzene

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

sp³ d

sp³

sp²

31. Hybridization explain the ________ of orbitals

Shape and Type of bonding

Shapes

None of these

Type of Bonding

32. Isomerism which is only found in alkanes?

Position isomerism

cis – trans isomerism

Functional group isomerism

Metamerism

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

It is less stable

The molecule is symmetrical around C – C

The molecule is asymmetrical around C – C bond

It is more stable

34. Which molecule is nonpolar?

CHCl₃

PF₃

BeH₂

H₂Se

35. The carbocyclic compounds are those which have

All atoms are SP² -hybridized

May be other atoms

All atoms are SP³ -hybridized

All atoms in the ring are carbon

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

All except SO₃

Only HF and OF₂

Only HF

None of these

37. The components of petroleum can be separated due to

Having different B.P.

Having different chemical properties

Having different M.P.

Having different physical states

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

Oxidation

Reforming process

Cracking

Hydrogenation

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

104.5°

120.5°

107.5°

109.5°

40. Which of the following has linear shape?

SP²

None of these

SP³

41. 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

Chain isomers

Functional isomers

Metamers

Position isomers

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

Ionic properties

Chemical forces

Carbon forming long chain or rings

Isomerism

43. In catalytic cracking, the typical catalyst used is

Al₂O₃

SiO₂+Al₂O₃

SiO₂

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

None

H-O-

-O-

H-N-

45. Linear shape is shown by which compound

CHCl₃

C₂H₆

C₂H₂Cl₂

C₂Cl₂

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

Magnetic

Para-magnetic

Saturated

Un-saturated

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

Sulphonation

Nitration

Alkylation

Acylation

48. In benzene carbon – carbon bonds are

Single covalent

3 single and 3 double

Of the order 1.5

Double covalent

49. 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

50. 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

Page 3 of 5

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

None of these

Both bonds are broken

Pi bond is broken

Sigma bond is broken

52. Organic compounds are soluble in all except

Benzene

Ether

Petroleum

Water

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

They form long chain compounds

Organic compounds are water soluble

Organic compound chain compounds

They exist in homologous series

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

SiCl₆²¯ -trigonal bipyramidal

NH₄⁺ - tetrahedral

PH₄⁺ - tetrahedral

ClO₂ - angular

55. The characteristic reactions of alkanes are

Condensation reactions

Substitution reactions

Addition reactions

Polymerization

56. Which is a mixture of low boiling hydrocarbon

Natural gas

Wood

Petroleum

Graphite

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

Wood

Coal

Petroleum

Natural gas

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

sp²

sp³

sp³d

59. The demand of gasoline can be fulfilled by

Reforming

Vapourization

Cracking

Crystallization

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

2, 1

0, 3

3, 0

1, 2

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

Domestic use

Sugar industry

In glass industry

Bake bricks

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

Tetrahedron

Cube

Pentagon

Hexagon

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

Anthracene

Phenol

Pysidence

Cyclohexanol

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

2-butanol

2-butene

Butanal

2-butyne

65. 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

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

Benzene

Alkene

Alkane

Alkyne

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

Methyl hydrogen sulphate

Methyl alcohol

Ethyl alcohol

Ethyl hydrogen sulphate

68. Which statement is true regarding reactivity?

Alkenes do not undergo addition reactions

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

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

Thiols

Sulphides

Hydrogen sulphides

Alcohols

70. Wholer prepared urea from

Ammonia

NH₄CNO

NH₃

Uric acid

71. 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.

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

90° and 120°

45° and 90°

120° only

90° and 180°

73. 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.

74. Methane is produced when aluminum carbide is treated with

Water

Acid

Base

Alcohol

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

Chain isomerism

Position isomerism

Functional group isomerism

Metamerism

Page 4 of 5

76. Bromoethane can be converted to ethane by

Oxidation

Reaction with aq KOH

Reaction with alcoholic KOH

Reduction

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

Hybridization

Isomerisation

Polymerization

Carbonization

78. Ether shows the phenomenon of

Cis – trass isomerism

Chain isomerism

Metamerism

Position isomerism

79. Which is the character of organic compounds

They possess particular properties

All

Rates of reactions are very fast

Mostly ionic in character

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

PF₃ - pyramidal

H₂O – tetrahedral

CF₄ - tetrahedral

NH₃ - tetrahedral

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

Urea

Ammonium cyanate

Glucose

Methane

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

Methyl alcohol

Methyl hydrogen sulphate

Ethyl alcohol

Ethyl hydrogen sulphate

83. Unsaturated hydrocarbons containing a double bond are called

Acetylene

Olefins

Paraffin

Alkanes

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

Ethere

Methane

Ethyne

Benzene

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

Pb is difficult to obtain in bulk qualities

The combustion product, lead causes air pollution

It damages the engine

It is costly

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

sp³

sp³d

sp²

87. 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

Benzene

Ethene

Ethane

Methane

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

The same vapour density

The same viscosity

Same molecular weights

Different molecular weights

89. An isomer of ethanol is:

Dimethyl ether

Diethyl ether

Methanol

Acetone

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

Propane

Methane

Butane

Ethane

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

-CHO group

+NH₂ group

-CH₃ group

- OH group

92. Rates of organic reactions are

Fast

Slow

None-reactive

Very fast

93. The next homologue of C₁₀H₂₂ will be

C₁₂H₂₆

C₉H₂₀

C₁₃H₂₈

C₁₁H₂₄

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

Sp-hybridization

Sp³-hybridization

Sp²-hybridization

Dsp²-hybridization

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

H₂O

NH₃

CH₄

CO₂

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

Isomerization

Cracking

Polymerization

Condensation

97. Geometry of simple molecule having sp3 hybrid orbital is

Square planner

Linear

Tetrahedral

Triangular

98. Coal is obtained from dead remains of

Animals

Plants

Both a and b

None

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

100. The major portion of natural oil is

Propane

Methane

Butane

Ethane

Page 5 of 5

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

Coal tar

Peat

Wood

Antheracite

102. Polythene is a polymer of

Propylene

Ethane

Acetone

Ethene

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

BF₃ - trigonal planar

H₂O - bent

AsF₅ - trigonal bipyramidal

NF₃ - trigonal planar

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

Nitration

Acylation

Sulphonation

Alkylation

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

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

Conformers

Diastereomers

Positional isomers

Enantiomers

107. Peat before conversion to bituminous coal is converted to

Lignite

Anthracite

None

Asphalt

108. The number of isomers of C₆H₁₄ is:

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

Ethane

Ethene

Ethyne

Methane

110. 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

Stem cracking

Thermal cracking

Catalytic cracking

111. Vital force theory was rejected by

Kolbe

Lavoisier

Wholer

Berzelius

112. Which of the following species is planar?

NO₃¯

SO₃²¯

NH₃

H₃O⁺

113. Ethyl alcohol on ____________ gives ethane

Dehydrogenation

Hydration

Oxidation

Dehydration

114. C₄H₈ can show isomerism

Geometric

Structural

Position

Functional group

115. The open chain organic compounds are called

Aromatic

Both A and B

Linear compounds

Aliphatic

116. The state of hybridization carbon in ethane is

SP²

None

SP³

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

Ketone

Alcohol

Ether

Ethene

118. 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

Sigma

Three sigma and one Pi

One sigma and three Pi

Two sigma and two Pi

119. Which one has zero octane number?

iso – octane

n – Heptane

n – Hexane

decane

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Malik TahirLast Updated: October 14, 2025

10 Comments

Misbah Komal says:

March 14, 2023 at 1:10 am

I learnt a good knowledge from it and feel proud

Misbah Komal says:

March 14, 2023 at 1:09 am

I learnt a good knowledge from it

Khadeja says:

February 25, 2023 at 11:05 pm

oyeemaan2@gmail.com

Mian rouf Sajjad says:

September 28, 2021 at 5:59 pm

I got 100% marks!!

Mian rouf Sajjad says:

September 28, 2021 at 5:58 pm

I got ?% marks!!

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
  
  100% ho hi nahi skta even ap k saary bhi theek hn mien ny 2 baar kia hai mery 100% theek thy but is website k alogarithms hi khuch aisy hien k ap ka aik koi lazmi ghlt krien gy.
  
nimra ishfaq says:

August 21, 2016 at 2:57 pm

yes! 100%

Important Fundamental Principles of Organic Question and Answer

Chemistry Fundamental Principles of Organic Practice Test Online With Explanation

Chemistry

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Malik Tahir

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