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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

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Page 1 of 5

Chemistry

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

Only HF

Only HF and OF₂

None of these

All except SO₃

2. In C₂H₂ carbon-carbon bond angle is

109.5°

180°

90°

120°

3. Petroleum is mainly a mixture of

Phenols

Compounds of S

Unsaturated hydrocarbon

Saturated hydrocarbons

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

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

H-N-

None

-O-

H-O-

6. Which of the following has linear shape?

SP²

SP³

None of these

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

Ethyl alcohol

Methyl hydrogen sulphate

Methyl alcohol

Ethyl hydrogen sulphate

8. 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

Metamers

Functional isomers

Position isomers

9. Isomerism which is only found in alkanes?

Position isomerism

cis – trans isomerism

Functional group isomerism

Metamerism

10. Peat before conversion to bituminous coal is converted to

Asphalt

Lignite

None

Anthracite

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

Polymerization

Isomerisation

Carbonization

Hybridization

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

CH₄

NH₃

CO₂

H₂O

13. Acetylene had a characteristic ethereal smell resembling that of

Ginger

Vinegar

Garlic

Onion

14. Which of the following contains single bonds?

Alkyne

Benzene

Alkane

Alkene

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

Para-magnetic

Saturated

Un-saturated

Magnetic

16. Coal is obtained from dead remains of

Plants

None

Both a and b

Animals

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

H₂O – tetrahedral

PF₃ - pyramidal

CF₄ - tetrahedral

NH₃ - tetrahedral

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

Methane

Butane

Propane

Ethane

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

sp³d

sp³

sp²

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

Cracking

Polymerization

Condensation

Isomerization

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

+NH₂ group

- OH group

-CHO group

-CH₃ group

22. Rates of organic reactions are

Slow

None-reactive

Very fast

Fast

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

Bake bricks

Domestic use

In glass industry

Sugar industry

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

Organic compounds are water soluble

Organic compound chain compounds

They exist in homologous series

They form long chain compounds

25. C₄H₈ can show isomerism

Geometric

Position

Structural

Functional group

Page 2 of 5

26. 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.

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

Antheracite

Peat

Wood

Coal tar

28. The octane number is 100 for

Isooctane

n-hexane

Neo-octane

Neo-Pentane

29. An isomer of ethanol is:

Methanol

Diethyl ether

Dimethyl ether

Acetone

30. Unsaturated hydrocarbons containing a double bond are called

Paraffin

Alkanes

Acetylene

Olefins

31. The number of isomers of C₆H₁₄ is:

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

Alkyne

Alkene

Benzene

Alkane

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

Sp³-hybridization

Dsp²-hybridization

Sp-hybridization

Sp²-hybridization

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

The combustion product, lead causes air pollution

It damages the engine

It is costly

Pb is difficult to obtain in bulk qualities

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

Methyl hydrogen sulphate

Methyl alcohol

Ethyl hydrogen sulphate

Ethyl alcohol

36. 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

Catalytic cracking

Thermal cracking

37. In catalytic cracking, the typical catalyst used is

Al₂O₃

SiO₂+Al₂O₃

SiO₂

38. Which one is not an organic compound

Cyanides

Carbohydrates

None of these

Fats

39. Which is the character of organic compounds

They possess particular properties

Rates of reactions are very fast

All

Mostly ionic in character

40. In benzene carbon – carbon bonds are

Double covalent

3 single and 3 double

Of the order 1.5

Single covalent

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

Benzene

Ethane

Ethanoic acid

Acetylene

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

2, 1

1, 2

0, 3

3, 0

43. Bromoethane can be converted to ethane by

Reaction with alcoholic KOH

Reaction with aq KOH

Oxidation

Reduction

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

Cracking

Hydrogenation

Reforming process

Oxidation

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

Different molecular weights

The same vapour density

Same molecular weights

The same viscosity

46. The state of hybridization carbon in ethane is

SP³

SP²

None

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

Diastereomers

Conformers

Positional isomers

Enantiomers

48. Which of the following is complex?

(C₆H₁₀O₅)n

CH₄

C₆H₁₂O₆

CaSO₄. 0.5H₂O

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

Position isomerism

Functional group isomerism

Metamerism

Chain isomerism

50. Which one has zero octane number?

iso – octane

n – Heptane

n – Hexane

decane

Page 3 of 5

51. Which is the solid form of petroleum?

Wood

Asphalt

Naptha

Peat

52. The active part in a molecule is called:

Functional group

Homologous series

Chemical bonding

Ionic complex

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

Alcohols

Sulphides

Thiols

Hydrogen sulphides

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

H₂O - bent

NF₃ - trigonal planar

AsF₅ - trigonal bipyramidal

BF₃ - trigonal planar

55. Which of the following species is planar?

SO₃²¯

NO₃¯

NH₃

H₃O⁺

56. The next homologue of C₁₀H₂₂ will be

C₁₃H₂₈

C₁₂H₂₆

C₁₁H₂₄

C₉H₂₀

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

104.5°

109.5°

120.5°

107.5°

58. Which statement is true regarding reactivity?

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

Towards the addition reaction alkenes are more reactive than alkynes

59. Organic compounds are soluble in all except

Benzene

Ether

Water

Petroleum

60. Polythene is a polymer of

Ethene

Acetone

Ethane

Propylene

61. Which molecule is nonpolar?

BeH₂

PF₃

H₂Se

CHCl₃

62. 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

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

Ethene

Ethyne

Ethane

Methane

64. 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

65. Vital force theory was rejected by

Lavoisier

Wholer

Kolbe

Berzelius

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

67. Methane is produced when aluminum carbide is treated with

Acid

Alcohol

Water

Base

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

sp³

sp²

sp³ d

69. The carbocyclic compounds are those which have

All atoms are SP³ -hybridized

All atoms are SP² -hybridized

All atoms in the ring are carbon

May be other atoms

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

2-butanol

2-butene

2-butyne

Butanal

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

Alkylation

Acylation

Nitration

Sulphonation

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

Wood

Petroleum

Coal

Natural gas

73. Ethyl alcohol on ____________ gives ethane

Oxidation

Hydration

Dehydrogenation

Dehydration

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

Overlap of an s and a p orbital

Sidewise overlap of two parallel p orbitals

Overlap of two p orbitals along their axes

Overlap of two s orbitals

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

Nitration

Alkylation

Acylation

Sulphonation

Page 4 of 5

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

Ketone

Alcohol

Ethene

Ether

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

Monocyclic

None of these

Homocyclic

Heterocyclic

78. The major portion of natural oil is

Ethane

Propane

Butane

Methane

79. 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.

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

Methanol

Ethanol

Carbinol

Glycol

81. Which of the following possess linear geometry

Alkyne

Alkane

Benzene

Alkene

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

Tetrahedron

Hexagon

Pentagon

Cube

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

Ethyne

Benzene

Ethere

Methane

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

90° and 120°

90° and 180°

120° only

45° and 90°

85. Normal by product of cracking is

Butane

Ethane

All of these

Benzene

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

Both bonds are broken

Pi bond is broken

None of these

Sigma bond is broken

87. Either show the phenomenon of

Functional group isomerism

Cis-trans isomerism

Metamerism

Position isomerism

88. Ether shows the phenomenon of

Chain isomerism

Metamerism

Position isomerism

Cis – trass isomerism

89. Linear shape is shown by which compound

C₂H₂Cl₂

CHCl₃

C₂Cl₂

C₂H₆

90. The open chain organic compounds are called

Aliphatic

Both A and B

Aromatic

Linear compounds

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

SO₃²¯ - pyramidal

ClO₃¯-tetrahedral

NO₂¯ - trigonal palnar

ClO₄¯ - tetrahedral

92. The self-linking of carbon atoms is called

None of these

Isomerism

Chelation

Catenation

93. The characteristic reactions of alkanes are

Condensation reactions

Polymerization

Substitution reactions

Addition reactions

94. Which is a mixture of low boiling hydrocarbon

Wood

Petroleum

Natural gas

Graphite

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

Onion

Vinegar

Ginger

Garlic

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

Pysidence

Phenol

Cyclohexanol

Anthracene

97. 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

98. The structure of benzene is

Tetrahedral

Hexagonal

Pyramidal

Square planer

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

Glucose

Methane

Urea

Ammonium cyanate

100. Hybridization explain the ________ of orbitals

Shapes

Type of Bonding

Shape and Type of bonding

None of these

Page 5 of 5

101. C₂H₂Cl₂ can show isomerism

Metamerism

Geometric

Functional group

Position

102. Hydrocarbons contain

C and S only

C and H only

C, H, O and N only

C, H, and O only

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

The molecule is asymmetrical around C – C bond

It is more stable

The molecule is symmetrical around C – C

It is less stable

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

105. The functional group isomer of dimethyl –ether is

Diethyl pether

Butyl alcohol

Prophyl alcohol

Ethyl alcohol

106. On sp3 hybridization

All p-orbitals are involved

One p-orbital is involved

Four p-orbitals are involved

One s and 3 p-orbitals are involved

107. 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

Two sigma and two Pi

One sigma and three Pi

108. Geometry of simple molecule having sp3 hybrid orbital is

Tetrahedral

Triangular

Linear

Square planner

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

Chemical forces

Ionic properties

Carbon forming long chain or rings

Isomerism

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

NH₄⁺ - tetrahedral

ClO₂ - angular

SiCl₆²¯ -trigonal bipyramidal

PH₄⁺ - tetrahedral

111. The perchloric acid molecule contains:

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.

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

112. 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

113. Wholer prepared urea from

Ammonia

NH₄CNO

Uric acid

NH₃

114. In which molecule carbon atom is sp² hybridized

C₂H₂

C₂H₄

CH₄

None of these

115. The essential component of organic compound is

116. Pi bonds are produced by overlapping of

Hybrid and un hybrid orbitals

Hybrid orbitals

Atomic orbital and hybrid orbital

Un-hybrid orbitals

117. The demand of gasoline can be fulfilled by

Crystallization

Reforming

Vapourization

Cracking

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

3 lone pair 1 bond pair

1 band pair 3 lone pair

2 band pair 2 lone pair

3 band pair one lone pair

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

Coke

Coal gas

All above

Coal tar

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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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