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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. Linear shape is shown by which compound

CHCl₃

C₂Cl₂

C₂H₆

C₂H₂Cl₂

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

All above

Coke

Coal tar

Coal gas

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

2-butene

2-butyne

Butanal

2-butanol

4. Vital force theory was rejected by

Wholer

Kolbe

Berzelius

Lavoisier

5. Rates of organic reactions are

Very fast

None-reactive

Fast

Slow

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

All except SO₃

None of these

Only HF and OF₂

Only HF

7. Either show the phenomenon of

Position isomerism

Metamerism

Cis-trans isomerism

Functional group isomerism

8. The functional group isomer of dimethyl –ether is

Diethyl pether

Butyl alcohol

Ethyl alcohol

Prophyl alcohol

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

Sp²-hybridization

Sp-hybridization

Dsp²-hybridization

Sp³-hybridization

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

Alkene

Alkane

Benzene

Alkyne

11. Acetylene had a characteristic ethereal smell resembling that of

Vinegar

Onion

Ginger

Garlic

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

Acetylene

Ethane

Ethanoic acid

Benzene

13. 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

Two sigma and two Pi

Sigma

Three sigma and one Pi

One sigma and three Pi

14. Which of the following contains single bonds?

Benzene

Alkane

Alkene

Alkyne

15. In benzene carbon – carbon bonds are

Of the order 1.5

Double covalent

Single covalent

3 single and 3 double

16. Normal by product of cracking is

All of these

Benzene

Ethane

Butane

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

ClO₃¯-tetrahedral

ClO₄¯ - tetrahedral

SO₃²¯ - pyramidal

NO₂¯ - trigonal palnar

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

Homocyclic

None of these

Heterocyclic

Monocyclic

19. Geometry of simple molecule having sp3 hybrid orbital is

Square planner

Linear

Tetrahedral

Triangular

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

Carbon forming long chain or rings

Ionic properties

Isomerism

Chemical forces

21. C₂H₂Cl₂ can show isomerism

Position

Functional group

Metamerism

Geometric

22. Unsaturated hydrocarbons containing a double bond are called

Acetylene

Paraffin

Olefins

Alkanes

23. 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

24. Which of the following has linear shape?

SP²

None of these

SP³

25. Isomerism which is only found in alkanes?

Metamerism

Functional group isomerism

cis – trans isomerism

Position isomerism

Page 2 of 5

26. In C₂H₂ carbon-carbon bond angle is

109.5°

90°

120°

180°

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

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

Para-magnetic

Magnetic

Un-saturated

Saturated

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

Ethere

Benzene

Ethyne

Methane

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

Metamerism

Position isomerism

Functional group isomerism

Chain isomerism

31. The components of petroleum can be separated due to

Having different B.P.

Having different chemical properties

Having different physical states

Having different M.P.

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

Butane

Methane

Propane

Ethane

33. Which one is not an organic compound

Cyanides

None of these

Carbohydrates

Fats

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

107.5°

104.5°

109.5°

120.5°

35. The active part in a molecule is called:

Chemical bonding

Homologous series

Ionic complex

Functional group

36. Which of the following possess linear geometry

Alkene

Alkane

Alkyne

Benzene

37. C₄H₈ can show isomerism

Position

Geometric

Functional group

Structural

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

Coal

Wood

Natural gas

Petroleum

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

Phenol

Anthracene

Cyclohexanol

Pysidence

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

Polymerization

Cracking

Condensation

Isomerization

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

CH₄

H₂O

CO₂

NH₃

42. Which molecule is nonpolar?

CHCl₃

PF₃

H₂Se

BeH₂

43. Polythene is a polymer of

Ethane

Propylene

Acetone

Ethene

44. 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

Methane

Ethene

Ethane

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

sp²

sp³

sp³d

46. Which is a mixture of low boiling hydrocarbon

Wood

Graphite

Petroleum

Natural gas

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

0, 3

1, 2

3, 0

2, 1

48. The structure of benzene is

Hexagonal

Pyramidal

Tetrahedral

Square planer

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

It is less stable

It is more stable

The molecule is asymmetrical around C – C bond

The molecule is symmetrical around C – C

50. Coal is obtained from dead remains of

None

Plants

Animals

Both a and b

Page 3 of 5

51. Which is the character of organic compounds

Mostly ionic in character

They possess particular properties

All

Rates of reactions are very fast

52. Petroleum is mainly a mixture of

Saturated hydrocarbons

Compounds of S

Unsaturated hydrocarbon

Phenols

53. Which of the following species is planar?

SO₃²¯

NH₃

H₃O⁺

NO₃¯

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

45° and 90°

90° and 120°

120° only

90° and 180°

55. The next homologue of C₁₀H₂₂ will be

C₁₁H₂₄

C₁₂H₂₆

C₉H₂₀

C₁₃H₂₈

56. Methane is produced when aluminum carbide is treated with

Base

Water

Acid

Alcohol

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

Oxidation

Hydrogenation

Cracking

Reforming process

58. The perchloric acid molecule contains:

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

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

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

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

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

Sidewise overlap of two parallel p orbitals

Overlap of two p orbitals along their axes

Overlap of two s orbitals

Overlap of an s and a p orbital

60. Ether shows the phenomenon of

Metamerism

Position isomerism

Cis – trass isomerism

Chain isomerism

61. Which of the following is complex?

CH₄

CaSO₄. 0.5H₂O

(C₆H₁₀O₅)n

C₆H₁₂O₆

62. On sp3 hybridization

Four p-orbitals are involved

One s and 3 p-orbitals are involved

All p-orbitals are involved

One p-orbital is involved

63. In catalytic cracking, the typical catalyst used is

SiO₂

SiO₂+Al₂O₃

Al₂O₃

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

Hybridization

Polymerization

Carbonization

Isomerisation

65. Bromoethane can be converted to ethane by

Reduction

Reaction with alcoholic KOH

Reaction with aq KOH

Oxidation

66. Alkanes cannot show cis-trans isomerism

Alkanes possess three groups attached to each carbon

0¯ bond required less energy to be rotated

The bond angle is 109.5°

0¯ bond is stronger than A-bond

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

Ethyne

Ethane

Methane

Ethene

68. An isomer of ethanol is:

Acetone

Dimethyl ether

Diethyl ether

Methanol

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

2 band pair 2 lone pair

1 band pair 3 lone pair

3 band pair one lone pair

3 lone pair 1 bond pair

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

Nitration

Alkylation

Acylation

Sulphonation

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

Methanol

Ethanol

Carbinol

Glycol

72. Straight chain hydrocarbons are

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

None of these

73. The open chain organic compounds are called

Aliphatic

Both A and B

Linear compounds

Aromatic

74. The self-linking of carbon atoms is called

Chelation

None of these

Isomerism

Catenation

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

Bake bricks

In glass industry

Domestic use

Sugar industry

Page 4 of 5

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

Alcohols

Thiols

Sulphides

Hydrogen sulphides

77. 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 is costly

Pb is difficult to obtain in bulk qualities

It damages the engine

78. Wholer prepared urea from

NH₃

Ammonia

Uric acid

NH₄CNO

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

Methyl alcohol

Ethyl alcohol

Ethyl hydrogen sulphate

Methyl hydrogen sulphate

80. 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

81. Peat before conversion to bituminous coal is converted to

None

Lignite

Asphalt

Anthracite

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

Same molecular weights

Different molecular weights

The same viscosity

The same vapour density

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

Wood

Peat

Antheracite

Coal tar

84. Which one has zero octane number?

iso – octane

n – Heptane

n – Hexane

decane

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

NH₄⁺ - tetrahedral

SiCl₆²¯ -trigonal bipyramidal

ClO₂ - angular

PH₄⁺ - tetrahedral

86. The major portion of natural oil is

Propane

Methane

Ethane

Butane

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

Positional isomers

Enantiomers

Diastereomers

Conformers

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

Hexagon

Cube

Pentagon

Tetrahedron

89. The characteristic reactions of alkanes are

Addition reactions

Condensation reactions

Polymerization

Substitution reactions

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

Methyl alcohol

Ethyl alcohol

Methyl hydrogen sulphate

Ethyl hydrogen sulphate

91. Organic compounds are soluble in all except

Water

Petroleum

Benzene

Ether

92. The octane number is 100 for

Isooctane

Neo-Pentane

Neo-octane

n-hexane

93. The components of petroleum can be separated due to

Having different M.P.

Having different chemical properties

Having different B.P.

Having different physical states

94. The carbocyclic compounds are those which have

May be other atoms

All atoms are SP² -hybridized

All atoms are SP³ -hybridized

All atoms in the ring are carbon

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

Sulphonation

Alkylation

Acylation

Nitration

96. 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

Metamers

Chain isomers

Functional isomers

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

Alcohol

Ketone

Ether

Ethene

98. The essential component of organic compound is

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

H-O-

-O-

None

H-N-

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

Page 5 of 5

101. Hydrocarbons contain

C, H, O and N only

C and H only

C, H, and O only

C and S only

102. In which molecule carbon atom is sp² hybridized

CH₄

None of these

C₂H₂

C₂H₄

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

104. Which is the solid form of petroleum?

Naptha

Peat

Asphalt

Wood

105. The state of hybridization carbon in ethane is

SP³

SP²

None

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

- OH group

-CHO group

-CH₃ group

+NH₂ group

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

sp³

sp²

sp³ d

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

Onion

Ginger

Vinegar

Garlic

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

Glucose

Methane

Urea

Ammonium cyanate

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:

Catalytic cracking

Normal cracking

Stem cracking

Thermal cracking

111. Pi bonds are produced by overlapping of

Hybrid and un hybrid orbitals

Atomic orbital and hybrid orbital

Hybrid orbitals

Un-hybrid orbitals

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

PF₃ - pyramidal

NH₃ - tetrahedral

CF₄ - tetrahedral

H₂O – tetrahedral

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

Sigma bond is broken

None of these

Pi bond is broken

Both bonds are broken

114. Which statement is true regarding reactivity?

Alkene decolourize bromine solution and Baeyer’s reagents but alkynes do not

Towards the addition reaction alkenes are more reactive than alkynes

Double and is stronger than single bond hence alkenes are less reactive than alkanes

Alkenes do not undergo addition reactions

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

AsF₅ - trigonal bipyramidal

BF₃ - trigonal planar

H₂O - bent

NF₃ - trigonal planar

116. Ethyl alcohol on ____________ gives ethane

Dehydrogenation

Hydration

Oxidation

Dehydration

117. The number of isomers of C₆H₁₄ is:

118. The demand of gasoline can be fulfilled by

Reforming

Crystallization

Cracking

Vapourization

119. Hybridization explain the ________ of orbitals

None of these

Shape and Type of bonding

Shapes

Type of Bonding

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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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