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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 next homologue of C₁₀H₂₂ will be

C₉H₂₀

C₁₂H₂₆

C₁₁H₂₄

C₁₃H₂₈

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

Coke

All above

Coal tar

Coal gas

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

sp²

sp³d

sp³

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

1, 2

3, 0

0, 3

2, 1

5. Vital force theory was rejected by

Berzelius

Wholer

Kolbe

Lavoisier

6. Which of the following has linear shape?

SP²

SP³

None of these

7. Either show the phenomenon of

Functional group isomerism

Metamerism

Position isomerism

Cis-trans isomerism

8. Hybridization explain the ________ of orbitals

None of these

Shapes

Shape and Type of bonding

Type of Bonding

9. Wholer prepared urea from

NH₄CNO

NH₃

Ammonia

Uric acid

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

Para-magnetic

Un-saturated

Saturated

Magnetic

11. Ether shows the phenomenon of

Cis – trass isomerism

Metamerism

Chain isomerism

Position isomerism

12. Ethyl alcohol on ____________ gives ethane

Oxidation

Hydration

Dehydration

Dehydrogenation

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

One sigma and three Pi

Sigma

Three sigma and one Pi

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

Ethyne

Methane

Ethene

Ethane

15. Polythene is a polymer of

Ethene

Ethane

Propylene

Acetone

16. The essential component of organic compound is

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

Organic compounds are water soluble

They form long chain compounds

They exist in homologous series

Organic compound chain compounds

18. 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

Thermal cracking

Stem cracking

Catalytic cracking

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

Positional isomers

Enantiomers

Conformers

Diastereomers

20. Which of the following species is planar?

NH₃

H₃O⁺

NO₃¯

SO₃²¯

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

In glass industry

Sugar industry

Domestic use

Bake bricks

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

Sulphonation

Acylation

Alkylation

Nitration

23. Which molecule is nonpolar?

CHCl₃

H₂Se

BeH₂

PF₃

24. Which is a mixture of low boiling hydrocarbon

Wood

Graphite

Petroleum

Natural gas

25. The active part in a molecule is called:

Functional group

Homologous series

Ionic complex

Chemical bonding

Page 2 of 5

26. Organic compounds are soluble in all except

Benzene

Petroleum

Water

Ether

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

Natural gas

Petroleum

Coal

Wood

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

Hexagon

Tetrahedron

Cube

Pentagon

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

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

Sulphonation

Acylation

Nitration

Alkylation

31. Which one has zero octane number?

iso – octane

n – Hexane

n – Heptane

decane

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

H-O-

-O-

H-N-

None

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

Coal tar

Wood

Antheracite

Peat

34. Which is the character of organic compounds

Rates of reactions are very fast

Mostly ionic in character

They possess particular properties

All

35. 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

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

BF₃ - trigonal planar

H₂O - bent

NF₃ - trigonal planar

AsF₅ - trigonal bipyramidal

37. Pi bonds are produced by overlapping of

Hybrid orbitals

Atomic orbital and hybrid orbital

Un-hybrid orbitals

Hybrid and un hybrid orbitals

38. The characteristic reactions of alkanes are

Substitution reactions

Polymerization

Condensation reactions

Addition reactions

39. Which is the solid form of petroleum?

Wood

Asphalt

Peat

Naptha

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

+NH₂ group

-CH₃ group

- OH group

-CHO group

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

Isomerism

Carbon forming long chain or rings

Chemical forces

Ionic properties

42. The perchloric acid molecule contains:

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

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

43. Acetylene had a characteristic ethereal smell resembling that of

Garlic

Ginger

Onion

Vinegar

44. The self-linking of carbon atoms is called

Chelation

None of these

Catenation

Isomerism

45. Which statement is true regarding reactivity?

Alkenes do not undergo addition reactions

Towards the addition reaction alkenes are more reactive than alkynes

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

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

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

Benzene

Ethyne

Methane

Ethere

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

Dsp²-hybridization

Sp²-hybridization

Sp³-hybridization

Sp-hybridization

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

Polymerization

Carbonization

Isomerisation

Hybridization

49. Coal is obtained from dead remains of

None

Both a and b

Animals

Plants

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

107.5°

104.5°

120.5°

109.5°

Page 3 of 5

51. Normal by product of cracking is

All of these

Ethane

Benzene

Butane

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

It is less stable

The molecule is symmetrical around C – C

The molecule is asymmetrical around C – C bond

It is more stable

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

Heterocyclic

Monocyclic

None of these

Homocyclic

54. Peat before conversion to bituminous coal is converted to

Lignite

None

Anthracite

Asphalt

55. The carbocyclic compounds are those which have

May be other atoms

All atoms are SP² -hybridized

All atoms in the ring are carbon

All atoms are SP³ -hybridized

56. Which of the following is complex?

C₆H₁₂O₆

CaSO₄. 0.5H₂O

CH₄

(C₆H₁₀O₅)n

57. 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

58. 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

Pb is difficult to obtain in bulk qualities

It is costly

59. Hydrocarbons contain

C, H, O and N only

C and H only

C, H, and O only

C and S only

60. The components of petroleum can be separated due to

Having different physical states

Having different chemical properties

Having different B.P.

Having different M.P.

61. 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

Functional isomers

Position isomers

Metamers

Chain isomers

62. C₄H₈ can show isomerism

Geometric

Position

Structural

Functional group

63. On sp3 hybridization

All p-orbitals are involved

One p-orbital is involved

One s and 3 p-orbitals are involved

Four p-orbitals are involved

64. The structure of benzene is

Tetrahedral

Square planer

Hexagonal

Pyramidal

65. Which one is not an organic compound

Fats

Cyanides

None of these

Carbohydrates

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

NH₃

CO₂

CH₄

H₂O

67. 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 an s and a p orbital

Overlap of two s orbitals

68. The functional group isomer of dimethyl –ether is

Ethyl alcohol

Diethyl pether

Prophyl alcohol

Butyl alcohol

69. Linear shape is shown by which compound

C₂H₂Cl₂

C₂H₆

C₂Cl₂

CHCl₃

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

2-butanol

Butanal

2-butyne

2-butene

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

Benzene

Alkane

Alkene

Alkyne

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

Glycol

Carbinol

Ethanol

Methanol

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

ClO₃¯-tetrahedral

NO₂¯ - trigonal palnar

ClO₄¯ - tetrahedral

SO₃²¯ - pyramidal

74. An isomer of ethanol is:

Methanol

Acetone

Diethyl ether

Dimethyl ether

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

Only HF

Only HF and OF₂

All except SO₃

None of these

Page 4 of 5

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

77. Alkanes cannot show cis-trans isomerism

0¯ bond is stronger than A-bond

The bond angle is 109.5°

0¯ bond required less energy to be rotated

Alkanes possess three groups attached to each carbon

78. Unsaturated hydrocarbons containing a double bond are called

Olefins

Acetylene

Alkanes

Paraffin

79. Which of the following contains single bonds?

Alkene

Benzene

Alkane

Alkyne

80. Which of the following possess linear geometry

Alkene

Benzene

Alkane

Alkyne

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

Metamerism

Chain isomerism

Functional group isomerism

Position isomerism

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

3 band pair one lone pair

1 band pair 3 lone pair

2 band pair 2 lone pair

3 lone pair 1 bond pair

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

Both bonds are broken

Pi bond is broken

Sigma bond is broken

None of these

84. Straight chain hydrocarbons are

Not in a series

None of these

In which each carbon is attached at least with three other carbon atoms

In which atoms of C are in a series

85. The open chain organic compounds are called

Linear compounds

Both A and B

Aliphatic

Aromatic

86. The components of petroleum can be separated due to

Having different physical states

Having different B.P.

Having different M.P.

Having different chemical properties

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

Vinegar

Garlic

Onion

Ginger

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

Sulphides

Alcohols

Thiols

Hydrogen sulphides

89. The demand of gasoline can be fulfilled by

Vapourization

Cracking

Reforming

Crystallization

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

sp²

sp³

sp³ d

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

Same molecular weights

The same vapour density

The same viscosity

Different molecular weights

92. The octane number is 100 for

Neo-Pentane

Isooctane

n-hexane

Neo-octane

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

Condensation

Isomerization

Polymerization

Cracking

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

Hydrogenation

Reforming process

Oxidation

Cracking

95. Methane is produced when aluminum carbide is treated with

Base

Water

Alcohol

Acid

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

Cyclohexanol

Anthracene

Phenol

Pysidence

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

Ammonium cyanate

Glucose

Methane

Urea

98. Petroleum is mainly a mixture of

Phenols

Saturated hydrocarbons

Compounds of S

Unsaturated hydrocarbon

99. The state of hybridization carbon in ethane is

SP³

SP²

None

100. In C₂H₂ carbon-carbon bond angle is

109.5°

120°

180°

90°

Page 5 of 5

101. Rates of organic reactions are

Very fast

None-reactive

Fast

Slow

102. Geometry of simple molecule having sp3 hybrid orbital is

Linear

Triangular

Square planner

Tetrahedral

103. In catalytic cracking, the typical catalyst used is

SiO₂+Al₂O₃

Al₂O₃

SiO₂

104. The major portion of natural oil is

Methane

Butane

Propane

Ethane

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

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

Ethane

Acetylene

Ethanoic acid

Benzene

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

Methyl alcohol

Methyl hydrogen sulphate

Ethyl hydrogen sulphate

Ethyl alcohol

108. In benzene carbon – carbon bonds are

Single covalent

Double covalent

Of the order 1.5

3 single and 3 double

109. In which molecule carbon atom is sp² hybridized

CH₄

C₂H₄

None of these

C₂H₂

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

Propane

Methane

Ethane

Butane

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

Alcohol

Ether

Ethene

Ketone

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

Ethyl alcohol

Ethyl hydrogen sulphate

Methyl alcohol

Methyl hydrogen sulphate

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

NH₃ - tetrahedral

CF₄ - tetrahedral

H₂O – tetrahedral

PF₃ - pyramidal

114. Isomerism which is only found in alkanes?

cis – trans isomerism

Position isomerism

Functional group isomerism

Metamerism

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

120° only

45° and 90°

90° and 120°

90° and 180°

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

NH₄⁺ - tetrahedral

PH₄⁺ - tetrahedral

SiCl₆²¯ -trigonal bipyramidal

ClO₂ - angular

117. The number of isomers of C₆H₁₄ is:

118. Bromoethane can be converted to ethane by

Reaction with alcoholic KOH

Reaction with aq KOH

Oxidation

Reduction

119. C₂H₂Cl₂ can show isomerism

Geometric

Metamerism

Functional group

Position

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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

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