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.
Test Helpful For:	Chemistry Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Chemistry Interview Question Answer

Chemistry Fundamental Principles of Organic Practice Test Online With Explanation

Please wait...

Page 1 of 5

Chemistry

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

Benzene

Alkene

Alkane

Alkyne

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

Coal

Wood

Natural gas

Petroleum

3. The functional group isomer of dimethyl –ether is

Butyl alcohol

Ethyl alcohol

Prophyl alcohol

Diethyl pether

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

Butane

Propane

Methane

Ethane

5. C₄H₈ can show isomerism

Structural

Position

Geometric

Functional group

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

Coke

All above

Coal tar

Coal gas

7. The next homologue of C₁₀H₂₂ will be

C₉H₂₀

C₁₁H₂₄

C₁₂H₂₆

C₁₃H₂₈

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

SiCl₆²¯ -trigonal bipyramidal

ClO₂ - angular

NH₄⁺ - tetrahedral

PH₄⁺ - tetrahedral

9. Straight chain hydrocarbons are

In which atoms of C are in a series

Not in a series

None of these

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

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

Hexagon

Cube

Tetrahedron

Pentagon

11. Which statement is true regarding reactivity?

Towards the addition reaction alkenes are more reactive than alkynes

Alkenes do not undergo addition reactions

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

12. 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

13. Peat before conversion to bituminous coal is converted to

Lignite

Anthracite

None

Asphalt

14. 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

Functional isomers

Chain isomers

Position isomers

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

Peat

Antheracite

Coal tar

Wood

16. Polythene is a polymer of

Ethene

Propylene

Acetone

Ethane

17. The components of petroleum can be separated due to

Having different M.P.

Having different physical states

Having different chemical properties

Having different B.P.

18. 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

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

Ginger

Garlic

Onion

Vinegar

20. In which molecule carbon atom is sp² hybridized

C₂H₄

None of these

C₂H₂

CH₄

21. The open chain organic compounds are called

Aromatic

Aliphatic

Linear compounds

Both A and B

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

1, 2

3, 0

2, 1

0, 3

23. Which of the following species is planar?

SO₃²¯

NH₃

NO₃¯

H₃O⁺

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

Thermal cracking

Catalytic cracking

Stem cracking

Normal cracking

25. The demand of gasoline can be fulfilled by

Vapourization

Crystallization

Cracking

Reforming

Page 2 of 5

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

Ethyne

Benzene

Ethere

Methane

27. Hydrocarbons contain

C and H only

C, H, and O only

C and S only

C, H, O and N only

28. Which molecule is nonpolar?

CHCl₃

PF₃

H₂Se

BeH₂

29. The major portion of natural oil is

Methane

Butane

Propane

Ethane

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

Ammonium cyanate

Methane

Glucose

Urea

31. Acetylene had a characteristic ethereal smell resembling that of

Onion

Ginger

Vinegar

Garlic

32. Which is the solid form of petroleum?

Wood

Asphalt

Naptha

Peat

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

Reforming process

Cracking

Hydrogenation

Oxidation

34. Ether shows the phenomenon of

Chain isomerism

Metamerism

Cis – trass isomerism

Position isomerism

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

Sulphides

Alcohols

Hydrogen sulphides

Thiols

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

sp³d

sp³

sp²

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

Overlap of two p orbitals along their axes

Overlap of two s orbitals

Overlap of an s and a p orbital

Sidewise overlap of two parallel p orbitals

38. In benzene carbon – carbon bonds are

Double covalent

Of the order 1.5

3 single and 3 double

Single covalent

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

Sp-hybridization

Sp²-hybridization

Dsp²-hybridization

Sp³-hybridization

40. Which one is not an organic compound

None of these

Fats

Carbohydrates

Cyanides

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

Polymerization

Condensation

Cracking

Isomerization

42. Normal by product of cracking is

All of these

Butane

Ethane

Benzene

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

Alkylation

Acylation

Nitration

Sulphonation

44. Either show the phenomenon of

Position isomerism

Functional group isomerism

Cis-trans isomerism

Metamerism

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

Ethene

Ether

Alcohol

Ketone

46. Organic compounds are soluble in all except

Water

Petroleum

Ether

Benzene

47. Which of the following contains single bonds?

Benzene

Alkyne

Alkene

Alkane

48. Vital force theory was rejected by

Kolbe

Wholer

Berzelius

Lavoisier

49. Pi bonds are produced by overlapping of

Un-hybrid orbitals

Atomic orbital and hybrid orbital

Hybrid orbitals

Hybrid and un hybrid orbitals

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

Page 3 of 5

51. Coal is obtained from dead remains of

Both a and b

None

Plants

Animals

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

The same viscosity

Different molecular weights

The same vapour density

Same molecular weights

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

Domestic use

Sugar industry

Bake bricks

In glass industry

54. In catalytic cracking, the typical catalyst used is

SiO₂

SiO₂+Al₂O₃

Al₂O₃

55. The state of hybridization carbon in ethane is

None

SP²

SP³

56. Bromoethane can be converted to ethane by

Oxidation

Reaction with alcoholic KOH

Reduction

Reaction with aq KOH

57. Alkanes cannot show cis-trans isomerism

0¯ bond required less energy to be rotated

The bond angle is 109.5°

Alkanes possess three groups attached to each carbon

0¯ bond is stronger than A-bond

58. Methane is produced when aluminum carbide is treated with

Water

Alcohol

Acid

Base

59. The structure of benzene is

Hexagonal

Square planer

Pyramidal

Tetrahedral

60. Geometry of simple molecule having sp3 hybrid orbital is

Tetrahedral

Triangular

Square planner

Linear

61. In C₂H₂ carbon-carbon bond angle is

180°

120°

109.5°

90°

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

Ethane

Ethanoic acid

Acetylene

Benzene

63. Ethyl alcohol on ____________ gives ethane

Oxidation

Dehydration

Dehydrogenation

Hydration

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

Methyl alcohol

Methyl hydrogen sulphate

Ethyl hydrogen sulphate

Ethyl alcohol

65. 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 less stable

It is more stable

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

Ethane

Methane

Ethene

Ethyne

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

90° and 180°

45° and 90°

90° and 120°

120° only

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

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

H-O-

H-N-

-O-

None

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

Homocyclic

Monocyclic

Heterocyclic

None of these

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

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

sp³ d

sp³

sp²

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

NH₃ - tetrahedral

PF₃ - pyramidal

CF₄ - tetrahedral

H₂O – tetrahedral

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

H₂O

CO₂

NH₃

CH₄

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

Hybridization

Carbonization

Isomerisation

Polymerization

Page 4 of 5

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

109.5°

120.5°

107.5°

104.5°

77. 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

78. Which one has zero octane number?

iso – octane

n – Hexane

decane

n – Heptane

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

Para-magnetic

Magnetic

Saturated

Un-saturated

80. Which of the following has linear shape?

None of these

SP³

SP²

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

Enantiomers

Diastereomers

Conformers

Positional isomers

82. The octane number is 100 for

Neo-Pentane

Neo-octane

Isooctane

n-hexane

83. Hybridization explain the ________ of orbitals

None of these

Shapes

Type of Bonding

Shape and Type of bonding

84. The active part in a molecule is called:

Functional group

Chemical bonding

Ionic complex

Homologous series

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

SO₃²¯ - pyramidal

ClO₄¯ - tetrahedral

NO₂¯ - trigonal palnar

ClO₃¯-tetrahedral

86. Linear shape is shown by which compound

CHCl₃

C₂H₆

C₂Cl₂

C₂H₂Cl₂

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

Sulphonation

Alkylation

Nitration

Acylation

88. 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

89. Petroleum is mainly a mixture of

Compounds of S

Phenols

Unsaturated hydrocarbon

Saturated hydrocarbons

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

AsF₅ - trigonal bipyramidal

H₂O - bent

NF₃ - trigonal planar

BF₃ - trigonal planar

91. Isomerism which is only found in alkanes?

Metamerism

cis – trans isomerism

Position isomerism

Functional group isomerism

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

Only HF

Only HF and OF₂

None of these

All except SO₃

93. Wholer prepared urea from

Uric acid

NH₄CNO

NH₃

Ammonia

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

-CH₃ group

+NH₂ group

- OH group

-CHO group

95. Rates of organic reactions are

Very fast

None-reactive

Fast

Slow

96. Unsaturated hydrocarbons containing a double bond are called

Paraffin

Acetylene

Olefins

Alkanes

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

Carbinol

Glycol

Ethanol

Methanol

98. 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

Two sigma and two Pi

Sigma

Three sigma and one Pi

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

Phenol

Anthracene

Pysidence

Cyclohexanol

100. 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

Page 5 of 5

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

3 band pair one lone pair

3 lone pair 1 bond pair

2 band pair 2 lone pair

1 band pair 3 lone pair

102. 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

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

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

103. Which is a mixture of low boiling hydrocarbon

Petroleum

Wood

Natural gas

Graphite

104. The essential component of organic compound is

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

They form long chain compounds

They exist in homologous series

Organic compounds are water soluble

Organic compound chain compounds

106. C₂H₂Cl₂ can show isomerism

Functional group

Geometric

Metamerism

Position

107. The number of isomers of C₆H₁₄ is:

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

2-butanol

2-butyne

2-butene

Butanal

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

Chemical forces

Isomerism

Carbon forming long chain or rings

Ionic properties

110. The self-linking of carbon atoms is called

Catenation

Chelation

None of these

Isomerism

111. Which is the character of organic compounds

Rates of reactions are very fast

Mostly ionic in character

They possess particular properties

All

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

Methyl alcohol

Ethyl alcohol

Methyl hydrogen sulphate

Ethyl hydrogen sulphate

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

Pi bond is broken

None of these

Sigma bond is broken

Both bonds are broken

114. Which of the following is complex?

C₆H₁₂O₆

CaSO₄. 0.5H₂O

(C₆H₁₀O₅)n

CH₄

115. On sp3 hybridization

Four p-orbitals are involved

One p-orbital is involved

All p-orbitals are involved

One s and 3 p-orbitals are involved

116. Which of the following possess linear geometry

Alkyne

Alkene

Benzene

Alkane

117. The characteristic reactions of alkanes are

Condensation reactions

Polymerization

Addition reactions

Substitution reactions

118. An isomer of ethanol is:

Diethyl ether

Acetone

Dimethyl ether

Methanol

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

Functional group isomerism

Position isomerism

Chain isomerism

Metamerism

More Related Resources

Punjab 12th Class Chemistry Chapter... ECAT Chemistry Fundamental Principl... 12th Class Chemistry Chapter 7 Fund... Punjab 12th class chemistry Online ... Chemistry Guess Papers Class 10th D... PPSC Test Syllabus for Chemistry Le... 10th Class Chemistry Chapter 5 Bioc... PMA ISSB Chemistry Initial Test Onl... 9th Class Chemistry Chapter 1 Funda... FBISE 9th Class Chemistry Chapter 1...

Can't find what you're looking for? Search below:

Latest Updates

ECAT Chemistry Fundamental Principles of Organic Chemistry Test O...
Punjab 12th class chemistry Online Test of Chapter No 07 Fundamen...
Chemistry Guess Papers Class 10th Download Online PDF 2026
PPSC Test Syllabus for Chemistry Lecturer Jobs 2026
PMA ISSB Chemistry Initial Test Online 2 Preparation
Mehran University Sindh ECAT Chemistry Entry Test Online Preparat...

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

More Related Resources

Latest Updates

Malik Tahir

10 Comments

Leave a Reply Cancel reply