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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. The essential component of organic compound is

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

Sulphonation

Nitration

Acylation

Alkylation

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

Diastereomers

Conformers

Positional isomers

Enantiomers

4. Wholer prepared urea from

NH₄CNO

NH₃

Uric acid

Ammonia

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

Pentagon

Tetrahedron

Hexagon

Cube

6. 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

Ethane

Ethene

7. Hydrocarbons contain

C, H, O and N only

C, H, and O only

C and H only

C and S only

8. Which of the following possess linear geometry

Alkyne

Alkene

Benzene

Alkane

9. Methane is produced when aluminum carbide is treated with

Acid

Base

Alcohol

Water

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

3, 0

1, 2

0, 3

2, 1

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

Cyclohexanol

Pysidence

Anthracene

Phenol

12. Which molecule is nonpolar?

CHCl₃

BeH₂

H₂Se

PF₃

13. An isomer of ethanol is:

Methanol

Diethyl ether

Acetone

Dimethyl ether

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

NO₂¯ - trigonal palnar

ClO₄¯ - tetrahedral

SO₃²¯ - pyramidal

ClO₃¯-tetrahedral

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

Ethyl alcohol

Methyl alcohol

Ethyl hydrogen sulphate

Methyl hydrogen sulphate

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

sp³

sp²

sp³ d

17. Alkanes cannot show cis-trans isomerism

Alkanes possess three groups attached to each carbon

0¯ bond is stronger than A-bond

The bond angle is 109.5°

0¯ bond required less energy to be rotated

18. Which of the following has linear shape?

SP³

SP²

None of these

19. The characteristic reactions of alkanes are

Condensation reactions

Polymerization

Substitution reactions

Addition reactions

20. 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

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

104.5°

107.5°

109.5°

120.5°

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

-O-

None

H-O-

H-N-

23. Which one has zero octane number?

n – Heptane

iso – octane

n – Hexane

decane

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

2-butanol

2-butene

Butanal

2-butyne

25. The components of petroleum can be separated due to

Having different chemical properties

Having different B.P.

Having different physical states

Having different M.P.

Page 2 of 5

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

Saturated

Magnetic

Un-saturated

Para-magnetic

27. 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

28. On sp3 hybridization

Four p-orbitals are involved

One p-orbital is involved

One s and 3 p-orbitals are involved

All p-orbitals are involved

29. Geometry of simple molecule having sp3 hybrid orbital is

Tetrahedral

Triangular

Linear

Square planner

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

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

Ethere

Benzene

Ethyne

Methane

32. In catalytic cracking, the typical catalyst used is

SiO₂+Al₂O₃

SiO₂

Al₂O₃

33. Which of the following contains single bonds?

Alkane

Alkene

Benzene

Alkyne

34. Unsaturated hydrocarbons containing a double bond are called

Acetylene

Alkanes

Olefins

Paraffin

35. Either show the phenomenon of

Metamerism

Functional group isomerism

Position isomerism

Cis-trans isomerism

36. 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

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

In glass industry

Bake bricks

Domestic use

Sugar industry

38. The number of isomers of C₆H₁₄ is:

39. The next homologue of C₁₀H₂₂ will be

C₁₁H₂₄

C₁₃H₂₈

C₉H₂₀

C₁₂H₂₆

40. Which statement is true regarding reactivity?

Alkenes do not undergo addition reactions

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

41. In C₂H₂ carbon-carbon bond angle is

109.5°

90°

180°

120°

42. Normal by product of cracking is

Benzene

Butane

Ethane

All of these

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

It is more stable

It is less stable

The molecule is asymmetrical around C – C bond

The molecule is symmetrical around C – C

44. The functional group isomer of dimethyl –ether is

Prophyl alcohol

Diethyl pether

Butyl alcohol

Ethyl alcohol

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

BF₃ - trigonal planar

AsF₅ - trigonal bipyramidal

NF₃ - trigonal planar

H₂O - bent

46. C₂H₂Cl₂ can show isomerism

Position

Metamerism

Functional group

Geometric

47. The components of petroleum can be separated due to

Having different B.P.

Having different physical states

Having different M.P.

Having different chemical properties

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

Methyl alcohol

Ethyl hydrogen sulphate

Methyl hydrogen sulphate

Ethyl alcohol

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

It damages the engine

It is costly

Pb is difficult to obtain in bulk qualities

The combustion product, lead causes air pollution

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

SiCl₆²¯ -trigonal bipyramidal

NH₄⁺ - tetrahedral

ClO₂ - angular

PH₄⁺ - tetrahedral

Page 3 of 5

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

None of these

Heterocyclic

Monocyclic

Homocyclic

52. Rates of organic reactions are

Very fast

Slow

None-reactive

Fast

53. Petroleum is mainly a mixture of

Compounds of S

Phenols

Unsaturated hydrocarbon

Saturated hydrocarbons

54. 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

55. The open chain organic compounds are called

Aromatic

Linear compounds

Both A and B

Aliphatic

56. The structure of benzene is

Tetrahedral

Hexagonal

Square planer

Pyramidal

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

CO₂

CH₄

H₂O

NH₃

58. The major portion of natural oil is

Butane

Methane

Ethane

Propane

59. Bromoethane can be converted to ethane by

Reduction

Oxidation

Reaction with alcoholic KOH

Reaction with aq KOH

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

Antheracite

Wood

Coal tar

Peat

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

sp²

sp³

sp³d

62. Which of the following is complex?

CH₄

C₆H₁₂O₆

(C₆H₁₀O₅)n

CaSO₄. 0.5H₂O

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

90° and 180°

90° and 120°

120° only

45° and 90°

64. Pi bonds are produced by overlapping of

Un-hybrid orbitals

Hybrid and un hybrid orbitals

Atomic orbital and hybrid orbital

Hybrid orbitals

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

Carbonization

Isomerisation

Hybridization

Polymerization

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

Polymerization

Isomerization

Cracking

Condensation

67. 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

Sigma

Three sigma and one Pi

Two sigma and two Pi

68. 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

69. Organic compounds are soluble in all except

Ether

Benzene

Water

Petroleum

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

Carbinol

Methanol

Glycol

Ethanol

71. Straight chain hydrocarbons are

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

Not in a series

72. Which one is not an organic compound

Carbohydrates

Cyanides

None of these

Fats

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

They exist in homologous series

Organic compound chain compounds

Organic compounds are water soluble

They form long chain compounds

74. The active part in a molecule is called:

Ionic complex

Functional group

Chemical bonding

Homologous series

75. Hybridization explain the ________ of orbitals

Type of Bonding

Shape and Type of bonding

Shapes

None of these

Page 4 of 5

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

Coal gas

Coal tar

All above

Coke

77. The demand of gasoline can be fulfilled by

Reforming

Cracking

Crystallization

Vapourization

78. Vital force theory was rejected by

Berzelius

Lavoisier

Kolbe

Wholer

79. The octane number is 100 for

Neo-octane

Neo-Pentane

Isooctane

n-hexane

80. Which of the following species is planar?

SO₃²¯

NO₃¯

NH₃

H₃O⁺

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

Wood

Coal

Natural gas

Petroleum

82. Acetylene had a characteristic ethereal smell resembling that of

Vinegar

Onion

Garlic

Ginger

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

Ethane

Ethanoic acid

Acetylene

Benzene

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

CF₄ - tetrahedral

H₂O – tetrahedral

NH₃ - tetrahedral

PF₃ - pyramidal

85. Coal is obtained from dead remains of

Plants

None

Animals

Both a and b

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

+NH₂ group

-CHO group

-CH₃ group

- OH group

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

Chain isomerism

Functional group isomerism

Position isomerism

Metamerism

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

Ether

Ketone

Alcohol

Ethene

89. Isomerism which is only found in alkanes?

cis – trans isomerism

Functional group isomerism

Metamerism

Position isomerism

90. Polythene is a polymer of

Ethane

Ethene

Acetone

Propylene

91. In which molecule carbon atom is sp² hybridized

C₂H₄

None of these

CH₄

C₂H₂

92. The state of hybridization carbon in ethane is

SP³

None

SP²

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

Thiols

Hydrogen sulphides

Sulphides

Alcohols

94. Peat before conversion to bituminous coal is converted to

None

Anthracite

Lignite

Asphalt

95. C₄H₈ can show isomerism

Position

Geometric

Functional group

Structural

96. Which is the solid form of petroleum?

Asphalt

Wood

Peat

Naptha

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

Ethene

Methane

Ethyne

Ethane

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

Dsp²-hybridization

Sp-hybridization

Sp³-hybridization

Sp²-hybridization

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

Same molecular weights

Different molecular weights

The same vapour density

The same viscosity

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

Benzene

Alkene

Alkyne

Alkane

Page 5 of 5

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

Glucose

Methane

Ammonium cyanate

Urea

102. Which is a mixture of low boiling hydrocarbon

Natural gas

Graphite

Wood

Petroleum

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

Ginger

Garlic

Onion

Vinegar

104. Linear shape is shown by which compound

C₂Cl₂

CHCl₃

C₂H₆

C₂H₂Cl₂

105. The self-linking of carbon atoms is called

None of these

Chelation

Catenation

Isomerism

106. The carbocyclic compounds are those which have

All atoms are SP² -hybridized

All atoms in the ring are carbon

All atoms are SP³ -hybridized

May be other atoms

107. The perchloric acid molecule contains:

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

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

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

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

108. Ethyl alcohol on ____________ gives ethane

Hydration

Dehydration

Oxidation

Dehydrogenation

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

Acylation

Nitration

Alkylation

Sulphonation

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

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

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

Reforming process

Cracking

Hydrogenation

Oxidation

113. In benzene carbon – carbon bonds are

Single covalent

Double covalent

3 single and 3 double

Of the order 1.5

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

None of these

Only HF

Only HF and OF₂

All except SO₃

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

Ethane

Butane

Methane

Propane

116. Which is the character of organic compounds

Mostly ionic in character

Rates of reactions are very fast

All

They possess particular properties

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

Ionic properties

Carbon forming long chain or rings

Chemical forces

Isomerism

118. Ether shows the phenomenon of

Position isomerism

Chain isomerism

Metamerism

Cis – trass isomerism

119. 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

Functional isomers

Chain isomers

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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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