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ECAT Chemistry Fundamental Principles of Organic Chemistry Test Online

Maan AliLast Updated: April 19, 2025

Chemistry Fundamental Principles of Organic Chemistry MCQS Online Test

ECAT Chemistry Fundamental Principles of Organic Chemistry Chapter Online Test

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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ECAT Chemistry Fundamental Principles of Organic Chemistry Test

Page 1 of 5

Chemistry

1. The demand of gasoline can be fulfilled by

Crystallization

Reforming

Vapourization

Cracking

2. Organic compounds are soluble in all except

Water

Petroleum

Benzene

Ether

3. Which one has zero octane number?

iso – octane

decane

n – Hexane

n – Heptane

4. Vital force theory was rejected by

Kolbe

Wholer

Berzelius

Lavoisier

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

sp²

sp³ d

sp³

6. Which is the character of organic compounds

Rates of reactions are very fast

All

Mostly ionic in character

They possess particular properties

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

Ethene

Alcohol

Ether

Ketone

8. The major portion of natural oil is

Butane

Propane

Ethane

Methane

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

Tetrahedron

Hexagon

Cube

Pentagon

10. In benzene carbon – carbon bonds are

3 single and 3 double

Of the order 1.5

Double covalent

Single covalent

11. Acetylene had a characteristic ethereal smell resembling that of

Onion

Ginger

Vinegar

Garlic

12. Which molecule is nonpolar?

H₂Se

CHCl₃

BeH₂

PF₃

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

Ethere

Ethyne

Benzene

Methane

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

Coal gas

Coke

Coal tar

All above

15. Unsaturated hydrocarbons containing a double bond are called

Olefins

Acetylene

Paraffin

Alkanes

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

Ethene

Methane

Ethane

Ethyne

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

It is more stable

The molecule is symmetrical around C – C

It is less stable

The molecule is asymmetrical around C – C bond

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

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

Bake bricks

Sugar industry

In glass industry

Domestic use

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

Antheracite

Coal tar

Peat

Wood

21. Which of the following has linear shape?

None of these

SP³

SP²

22. Which is a mixture of low boiling hydrocarbon

Petroleum

Natural gas

Wood

Graphite

23. 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

24. The essential component of organic compound is

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

Wood

Natural gas

Coal

Petroleum

Page 2 of 5

26. The components of petroleum can be separated due to

Having different M.P.

Having different B.P.

Having different chemical properties

Having different physical states

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

Isomerisation

Hybridization

Carbonization

Polymerization

28. 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

29. Which statement is true regarding reactivity?

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

Alkenes do not undergo addition reactions

Towards the addition reaction alkenes are more reactive than alkynes

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

Methane

Glucose

Ammonium cyanate

Urea

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

SO₃²¯ - pyramidal

NO₂¯ - trigonal palnar

ClO₄¯ - tetrahedral

ClO₃¯-tetrahedral

32. Which one is not an organic compound

Fats

None of these

Carbohydrates

Cyanides

33. The active part in a molecule is called:

Chemical bonding

Ionic complex

Functional group

Homologous series

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

Hydrogenation

Cracking

Oxidation

Reforming process

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

Carbinol

Glycol

Methanol

Ethanol

36. C₄H₈ can show isomerism

Geometric

Structural

Functional group

Position

37. Methane is produced when aluminum carbide is treated with

Base

Alcohol

Acid

Water

38. The perchloric acid molecule contains:

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

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

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

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

39. Coal is obtained from dead remains of

None

Animals

Plants

Both a and b

40. The octane number is 100 for

n-hexane

Neo-octane

Neo-Pentane

Isooctane

41. Bromoethane can be converted to ethane by

Reaction with alcoholic KOH

Oxidation

Reaction with aq KOH

Reduction

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

Onion

Vinegar

Garlic

Ginger

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

Polymerization

Isomerization

Condensation

Cracking

44. The components of petroleum can be separated due to

Having different physical states

Having different chemical properties

Having different M.P.

Having different B.P.

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

Different molecular weights

The same viscosity

Same molecular weights

The same vapour density

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

Functional group isomerism

Position isomerism

Metamerism

Chain isomerism

47. The open chain organic compounds are called

Aliphatic

Linear compounds

Aromatic

Both A and B

48. 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

Position isomers

Functional isomers

Chain isomers

Metamers

49. Ethyl alcohol on ____________ gives ethane

Dehydrogenation

Dehydration

Hydration

Oxidation

50. The characteristic reactions of alkanes are

Polymerization

Condensation reactions

Substitution reactions

Addition reactions

Page 3 of 5

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

sp³d

sp²

sp³

52. Which of the following is complex?

CH₄

C₆H₁₂O₆

CaSO₄. 0.5H₂O

(C₆H₁₀O₅)n

53. 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

Two sigma and two Pi

One sigma and three Pi

Sigma

54. Wholer prepared urea from

Uric acid

Ammonia

NH₃

NH₄CNO

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

Positional isomers

Enantiomers

Diastereomers

Conformers

56. The functional group isomer of dimethyl –ether is

Ethyl alcohol

Butyl alcohol

Diethyl pether

Prophyl alcohol

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

Methane

Ethane

Propane

Butane

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

H-O-

-O-

H-N-

None

59. Isomerism which is only found in alkanes?

Functional group isomerism

cis – trans isomerism

Position isomerism

Metamerism

60. In which molecule carbon atom is sp² hybridized

CH₄

None of these

C₂H₂

C₂H₄

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

62. Either show the phenomenon of

Position isomerism

Metamerism

Functional group isomerism

Cis-trans isomerism

63. Hydrocarbons contain

C and S only

C, H, and O only

C, H, O and N only

C and H only

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

2-butene

2-butyne

2-butanol

Butanal

65. Rates of organic reactions are

None-reactive

Slow

Fast

Very fast

66. Which of the following species is planar?

SO₃²¯

NH₃

H₃O⁺

NO₃¯

67. In C₂H₂ carbon-carbon bond angle is

180°

120°

109.5°

90°

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

Sulphonation

Nitration

Alkylation

Acylation

69. 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

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

All except SO₃

Only HF and OF₂

None of these

Only HF

71. 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

Methane

Benzene

Ethane

72. Pi bonds are produced by overlapping of

Hybrid and un hybrid orbitals

Hybrid orbitals

Un-hybrid orbitals

Atomic orbital and hybrid orbital

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

Hydrogen sulphides

Alcohols

Sulphides

Thiols

74. Peat before conversion to bituminous coal is converted to

Anthracite

Lignite

None

Asphalt

75. Which of the following contains single bonds?

Alkane

Benzene

Alkyne

Alkene

Page 4 of 5

76. Normal by product of cracking is

Ethane

All of these

Butane

Benzene

77. Hybridization explain the ________ of orbitals

Type of Bonding

Shapes

Shape and Type of bonding

None of these

78. In catalytic cracking, the typical catalyst used is

SiO₂

SiO₂+Al₂O₃

Al₂O₃

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

1, 2

0, 3

3, 0

2, 1

80. Petroleum is mainly a mixture of

Saturated hydrocarbons

Unsaturated hydrocarbon

Compounds of S

Phenols

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

Overlap of two s orbitals

Sidewise overlap of two parallel p orbitals

Overlap of two p orbitals along their axes

Overlap of an s and a p orbital

82. C₂H₂Cl₂ can show isomerism

Metamerism

Geometric

Position

Functional group

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

Carbon forming long chain or rings

Isomerism

Ionic properties

Chemical forces

84. Polythene is a polymer of

Ethane

Acetone

Ethene

Propylene

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

CO₂

H₂O

NH₃

CH₄

86. The structure of benzene is

Pyramidal

Square planer

Tetrahedral

Hexagonal

87. 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

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

Phenol

Anthracene

Cyclohexanol

Pysidence

89. 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

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

90° and 180°

90° and 120°

45° and 90°

120° only

91. The next homologue of C₁₀H₂₂ will be

C₁₃H₂₈

C₁₁H₂₄

C₁₂H₂₆

C₉H₂₀

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

H₂O – tetrahedral

PF₃ - pyramidal

NH₃ - tetrahedral

CF₄ - tetrahedral

93. Ether shows the phenomenon of

Cis – trass isomerism

Position isomerism

Metamerism

Chain isomerism

94. Geometry of simple molecule having sp3 hybrid orbital is

Square planner

Tetrahedral

Linear

Triangular

95. An isomer of ethanol is:

Acetone

Methanol

Dimethyl ether

Diethyl ether

96. Linear shape is shown by which compound

C₂H₂Cl₂

CHCl₃

C₂Cl₂

C₂H₆

97. The number of isomers of C₆H₁₄ is:

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

Catalytic cracking

Stem cracking

Normal cracking

Thermal cracking

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

Ethanoic acid

Ethane

Acetylene

Benzene

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

Para-magnetic

Magnetic

Un-saturated

Saturated

Page 5 of 5

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

Dsp²-hybridization

Sp³-hybridization

Sp-hybridization

Sp²-hybridization

102. The state of hybridization carbon in ethane is

SP³

SP²

None

103. 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

104. Which of the following possess linear geometry

Benzene

Alkane

Alkyne

Alkene

105. The carbocyclic compounds are those which have

May be other atoms

All atoms are SP³ -hybridized

All atoms in the ring are carbon

All atoms are SP² -hybridized

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

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

NF₃ - trigonal planar

AsF₅ - trigonal bipyramidal

H₂O - bent

BF₃ - trigonal planar

108. Which is the solid form of petroleum?

Wood

Asphalt

Peat

Naptha

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

-CH₃ group

+NH₂ group

- OH group

-CHO group

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

Homocyclic

Heterocyclic

Monocyclic

None of these

111. The self-linking of carbon atoms is called

Isomerism

Chelation

None of these

Catenation

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

Nitration

Sulphonation

Acylation

Alkylation

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

NH₄⁺ - tetrahedral

ClO₂ - angular

PH₄⁺ - tetrahedral

SiCl₆²¯ -trigonal bipyramidal

114. 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

115. Alkanes cannot show cis-trans isomerism

0¯ bond is stronger than A-bond

0¯ bond required less energy to be rotated

The bond angle is 109.5°

Alkanes possess three groups attached to each carbon

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

Alkene

Alkane

Benzene

Alkyne

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

109.5°

104.5°

120.5°

107.5°

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

sp³

sp²

sp³d

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

Sigma bond is broken

Pi bond is broken

None of these

Both bonds are broken

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Maan AliLast Updated: April 19, 2025

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6 Comments

Rabbia says:

July 27, 2017 at 7:42 pm

Is this important mcqs? ?

1. Zeeshan says:
  
  July 14, 2022 at 10:09 am
  
  IS my sy kuch important hn but zyada trr benzene or Alkyl halide waly chapter sy aaty hn orr 8 chapter Alkane,Alkene or lkyne wala !!!
  
abdulrehman ali says:

July 2, 2017 at 11:15 pm

yehi to pta nai

Qureshi148 says:

July 1, 2017 at 8:15 pm

bkwaas bilkul bkwaas

Pervez says:

March 22, 2017 at 1:40 pm

nice

Farhan aslam says:

November 29, 2016 at 11:15 am

In me se kich aata bhi ha?

ECAT Chemistry Fundamental Principles of Organic Chemistry Test Online

Chemistry Fundamental Principles of Organic Chemistry MCQS Online Test

ECAT Chemistry Fundamental Principles of Organic Chemistry Chapter Online Test

ECAT Chemistry Fundamental Principles of Organic Chemistry Test

Chemistry

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Chemistry Fundamental Principles of Organic Chemistry MCQS Online Test

ECAT Chemistry Fundamental Principles of Organic Chemistry Chapter Online Test

ECAT Chemistry Fundamental Principles of Organic Chemistry Test

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