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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 is a mixture of low boiling hydrocarbon

Natural gas

Graphite

Petroleum

Wood

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

Hybridization

Carbonization

Polymerization

Isomerisation

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

+NH₂ group

-CHO group

-CH₃ group

- OH group

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

Nitration

Sulphonation

Alkylation

Acylation

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

The same vapour density

Different molecular weights

Same molecular weights

The same viscosity

6. 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

7. Hydrocarbons contain

C and H only

C, H, and O only

C and S only

C, H, O and N only

8. 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

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

45° and 90°

90° and 120°

90° and 180°

120° only

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

3, 0

1, 2

2, 1

0, 3

11. Either show the phenomenon of

Functional group isomerism

Cis-trans isomerism

Metamerism

Position isomerism

12. The open chain organic compounds are called

Both A and B

Aromatic

Aliphatic

Linear compounds

13. The structure of benzene is

Hexagonal

Square planer

Tetrahedral

Pyramidal

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

Methane

Glucose

Ammonium cyanate

Urea

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

Ethane

Ethyne

Ethene

Methane

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

Butane

Ethane

Propane

Methane

17. The functional group isomer of dimethyl –ether is

Diethyl pether

Prophyl alcohol

Ethyl alcohol

Butyl alcohol

18. Methane is produced when aluminum carbide is treated with

Base

Acid

Water

Alcohol

19. Which one has zero octane number?

n – Heptane

n – Hexane

decane

iso – octane

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

21. Polythene is a polymer of

Ethane

Ethene

Propylene

Acetone

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

Benzene

Ethanoic acid

Ethane

Acetylene

23. An isomer of ethanol is:

Acetone

Dimethyl ether

Methanol

Diethyl ether

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

Pysidence

Phenol

Cyclohexanol

Anthracene

25. The carbocyclic compounds are those which have

All atoms are SP³ -hybridized

All atoms in the ring are carbon

May be other atoms

All atoms are SP² -hybridized

Page 2 of 5

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

NH₄⁺ - tetrahedral

SiCl₆²¯ -trigonal bipyramidal

PH₄⁺ - tetrahedral

ClO₂ - angular

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

Organic compounds are water soluble

Organic compound chain compounds

They form long chain compounds

They exist in homologous series

28. Isomerism which is only found in alkanes?

Functional group isomerism

Position isomerism

cis – trans isomerism

Metamerism

29. Which of the following species is planar?

H₃O⁺

SO₃²¯

NO₃¯

NH₃

30. C₄H₈ can show isomerism

Geometric

Position

Functional group

Structural

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

None of these

Monocyclic

Homocyclic

Heterocyclic

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

104.5°

107.5°

109.5°

120.5°

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

Sulphonation

Nitration

Alkylation

Acylation

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

H-N-

-O-

H-O-

None

35. The active part in a molecule is called:

Ionic complex

Chemical bonding

Homologous series

Functional group

36. Vital force theory was rejected by

Kolbe

Lavoisier

Wholer

Berzelius

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

sp²

sp³d

sp³

38. In benzene carbon – carbon bonds are

Single covalent

3 single and 3 double

Double covalent

Of the order 1.5

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

Ethyl alcohol

Ethyl hydrogen sulphate

Methyl hydrogen sulphate

Methyl alcohol

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

Alkene

Alkane

Benzene

Alkyne

41. Peat before conversion to bituminous coal is converted to

Lignite

None

Anthracite

Asphalt

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

Diastereomers

Enantiomers

Positional isomers

Conformers

43. Which is the character of organic compounds

Rates of reactions are very fast

Mostly ionic in character

All

They possess particular properties

44. 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.

45. Hybridization explain the ________ of orbitals

Type of Bonding

Shape and Type of bonding

None of these

Shapes

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

It damages the engine

The combustion product, lead causes air pollution

It is costly

Pb is difficult to obtain in bulk qualities

47. In which molecule carbon atom is sp² hybridized

None of these

CH₄

C₂H₄

C₂H₂

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

Wood

Natural gas

Petroleum

Coal

49. Linear shape is shown by which compound

C₂H₆

C₂Cl₂

C₂H₂Cl₂

CHCl₃

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

Page 3 of 5

51. Coal is obtained from dead remains of

Both a and b

Plants

Animals

None

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

Chain isomerism

Position isomerism

Metamerism

Functional group isomerism

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

NO₂¯ - trigonal palnar

ClO₃¯-tetrahedral

ClO₄¯ - tetrahedral

SO₃²¯ - pyramidal

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

Hexagon

Tetrahedron

Cube

Pentagon

55. 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

Ethane

Ethene

Benzene

56. Bromoethane can be converted to ethane by

Reaction with aq KOH

Reaction with alcoholic KOH

Oxidation

Reduction

57. Geometry of simple molecule having sp3 hybrid orbital is

Tetrahedral

Triangular

Square planner

Linear

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

Garlic

Ginger

Onion

Vinegar

59. Which of the following contains single bonds?

Alkyne

Alkene

Benzene

Alkane

60. Unsaturated hydrocarbons containing a double bond are called

Acetylene

Paraffin

Olefins

Alkanes

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

The molecule is symmetrical around C – C

It is less stable

The molecule is asymmetrical around C – C bond

It is more stable

62. The characteristic reactions of alkanes are

Substitution reactions

Addition reactions

Condensation reactions

Polymerization

63. Ethyl alcohol on ____________ gives ethane

Dehydrogenation

Oxidation

Hydration

Dehydration

64. Rates of organic reactions are

Very fast

None-reactive

Fast

Slow

65. Wholer prepared urea from

Ammonia

NH₄CNO

NH₃

Uric acid

66. 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 s orbitals

Overlap of two p orbitals along their axes

67. The perchloric acid molecule contains:

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

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.

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

Coal tar

Coke

Coal gas

All above

69. In C₂H₂ carbon-carbon bond angle is

180°

120°

90°

109.5°

70. The major portion of natural oil is

Propane

Methane

Ethane

Butane

71. Organic compounds are soluble in all except

Ether

Petroleum

Benzene

Water

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

Methyl hydrogen sulphate

Ethyl alcohol

Methyl alcohol

Ethyl hydrogen sulphate

73. The components of petroleum can be separated due to

Having different physical states

Having different B.P.

Having different chemical properties

Having different M.P.

74. Ether shows the phenomenon of

Position isomerism

Metamerism

Chain isomerism

Cis – trass isomerism

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

Antheracite

Peat

Coal tar

Wood

Page 4 of 5

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

Ionic properties

Carbon forming long chain or rings

Chemical forces

Isomerism

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

Hydrogenation

Cracking

Oxidation

Reforming process

78. Normal by product of cracking is

Ethane

All of these

Butane

Benzene

79. The self-linking of carbon atoms is called

Isomerism

Catenation

None of these

Chelation

80. Which of the following has linear shape?

SP²

None of these

SP³

81. 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

82. 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

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

2-butanol

Butanal

2-butene

2-butyne

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

Ketone

Ethene

Alcohol

Ether

85. The next homologue of C₁₀H₂₂ will be

C₁₃H₂₈

C₁₁H₂₄

C₉H₂₀

C₁₂H₂₆

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

Bake bricks

Sugar industry

In glass industry

Domestic use

87. In catalytic cracking, the typical catalyst used is

SiO₂+Al₂O₃

SiO₂

Al₂O₃

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

sp²

sp³ d

sp³

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

Thiols

Alcohols

Sulphides

Hydrogen sulphides

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

Ethanol

Methanol

Glycol

Carbinol

91. Which molecule is nonpolar?

BeH₂

PF₃

H₂Se

CHCl₃

92. Petroleum is mainly a mixture of

Compounds of S

Phenols

Unsaturated hydrocarbon

Saturated hydrocarbons

93. The octane number is 100 for

n-hexane

Isooctane

Neo-octane

Neo-Pentane

94. 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

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

CF₄ - tetrahedral

PF₃ - pyramidal

NH₃ - tetrahedral

H₂O – tetrahedral

96. Which of the following possess linear geometry

Alkyne

Alkane

Alkene

Benzene

97. Which one is not an organic compound

None of these

Fats

Cyanides

Carbohydrates

98. Acetylene had a characteristic ethereal smell resembling that of

Garlic

Onion

Ginger

Vinegar

99. 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

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

Ethere

Methane

Benzene

Ethyne

Page 5 of 5

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

Para-magnetic

Un-saturated

Magnetic

Saturated

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

NF₃ - trigonal planar

BF₃ - trigonal planar

H₂O - bent

AsF₅ - trigonal bipyramidal

103. The essential component of organic compound is

104. 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

105. Alkanes cannot show cis-trans isomerism

The bond angle is 109.5°

0¯ bond required less energy to be rotated

Alkanes possess three groups attached to each carbon

0¯ bond is stronger than A-bond

106. The demand of gasoline can be fulfilled by

Crystallization

Cracking

Reforming

Vapourization

107. Which is the solid form of petroleum?

Asphalt

Naptha

Peat

Wood

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

109. The number of isomers of C₆H₁₄ is:

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

sp²

sp³d

sp³

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

Isomerization

Condensation

Cracking

Polymerization

112. 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

Position isomers

Functional isomers

113. The state of hybridization carbon in ethane is

None

SP²

SP³

114. Pi bonds are produced by overlapping of

Un-hybrid orbitals

Hybrid orbitals

Atomic orbital and hybrid orbital

Hybrid and un hybrid orbitals

115. C₂H₂Cl₂ can show isomerism

Metamerism

Functional group

Position

Geometric

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

None of these

Only HF

All except SO₃

Only HF and OF₂

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

CO₂

CH₄

NH₃

H₂O

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

None of these

Sigma bond is broken

Pi bond is broken

Both bonds are broken

119. Which of the following is complex?

CH₄

CaSO₄. 0.5H₂O

(C₆H₁₀O₅)n

C₆H₁₂O₆

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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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