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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. Ethyl alcohol on ____________ gives ethane

Dehydrogenation

Oxidation

Dehydration

Hydration

2. A π (pi) bond is the result of the

Overlap of an s and a p orbital

Overlap of two s orbitals

Overlap of two p orbitals along their axes

Sidewise overlap of two parallel p orbitals

3. In benzene carbon – carbon bonds are

Of the order 1.5

3 single and 3 double

Single covalent

Double covalent

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

Same molecular weights

The same vapour density

The same viscosity

Different molecular weights

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

Metamerism

Chain isomerism

Position isomerism

Functional group isomerism

6. Isomerism which is only found in alkanes?

Position isomerism

Functional group isomerism

cis – trans isomerism

Metamerism

7. Coal is obtained from dead remains of

Both a and b

None

Plants

Animals

8. The major portion of natural oil is

Butane

Propane

Methane

Ethane

9. Bromoethane can be converted to ethane by

Reaction with aq KOH

Oxidation

Reaction with alcoholic KOH

Reduction

10. The components of petroleum can be separated due to

Having different M.P.

Having different B.P.

Having different physical states

Having different chemical properties

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

All above

Coal tar

Coal gas

Coke

12. Which is a mixture of low boiling hydrocarbon

Wood

Natural gas

Graphite

Petroleum

13. 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

Metamers

Position isomers

Chain isomers

Functional isomers

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

Ginger

Onion

Vinegar

Garlic

15. Straight chain hydrocarbons are

None of these

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

Not in a series

In which atoms of C are in a series

16. The essential component of organic compound is

17. The next homologue of C₁₀H₂₂ will be

C₉H₂₀

C₁₂H₂₆

C₁₁H₂₄

C₁₃H₂₈

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

+NH₂ group

- OH group

-CHO group

-CH₃ group

19. In C₂H₂ carbon-carbon bond angle is

90°

120°

109.5°

180°

20. Which of the following species is planar?

SO₃²¯

NH₃

NO₃¯

H₃O⁺

21. Which of the following contains single bonds?

Alkene

Alkane

Benzene

Alkyne

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

Pb is difficult to obtain in bulk qualities

It damages the engine

It is costly

The combustion product, lead causes air pollution

23. 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

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

-O-

H-O-

None

H-N-

25. In which molecule carbon atom is sp² hybridized

C₂H₄

CH₄

None of these

C₂H₂

Page 2 of 5

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

AsF₅ - trigonal bipyramidal

BF₃ - trigonal planar

NF₃ - trigonal planar

H₂O - bent

27. The octane number is 100 for

Isooctane

Neo-Pentane

n-hexane

Neo-octane

28. Vital force theory was rejected by

Wholer

Kolbe

Lavoisier

Berzelius

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

Ethanol

Methanol

Carbinol

Glycol

30. Rates of organic reactions are

Fast

None-reactive

Slow

Very fast

31. Which of the following is complex?

C₆H₁₂O₆

(C₆H₁₀O₅)n

CaSO₄. 0.5H₂O

CH₄

32. Peat before conversion to bituminous coal is converted to

Anthracite

Asphalt

Lignite

None

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

Un-saturated

Para-magnetic

Saturated

Magnetic

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

Alcohol

Ketone

Ether

Ethene

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

2-butyne

2-butanol

2-butene

Butanal

36. The self-linking of carbon atoms is called

None of these

Isomerism

Chelation

Catenation

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

Hydrogen sulphides

Sulphides

Alcohols

Thiols

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

39. Linear shape is shown by which compound

C₂H₆

CHCl₃

C₂Cl₂

C₂H₂Cl₂

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

107.5°

120.5°

109.5°

104.5°

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

Pysidence

Anthracene

Cyclohexanol

Phenol

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

Only HF

Only HF and OF₂

None of these

All except SO₃

43. Which molecule is nonpolar?

PF₃

H₂Se

BeH₂

CHCl₃

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

They form long chain compounds

Organic compound chain compounds

They exist in homologous series

Organic compounds are water soluble

45. Acetylene had a characteristic ethereal smell resembling that of

Garlic

Onion

Ginger

Vinegar

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

Ethane

Ethyne

Ethene

Methane

47. Organic compounds are soluble in all except

Benzene

Ether

Water

Petroleum

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

Nitration

Acylation

Alkylation

Sulphonation

49. Which of the following has linear shape?

SP³

SP²

None of these

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

Ethere

Benzene

Methane

Ethyne

Page 3 of 5

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

Dsp²-hybridization

Sp³-hybridization

Sp²-hybridization

Sp-hybridization

52. Pi bonds are produced by overlapping of

Atomic orbital and hybrid orbital

Un-hybrid orbitals

Hybrid and un hybrid orbitals

Hybrid orbitals

53. Which is the solid form of petroleum?

Naptha

Peat

Asphalt

Wood

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

Hexagon

Cube

Tetrahedron

Pentagon

55. Unsaturated hydrocarbons containing a double bond are called

Acetylene

Paraffin

Olefins

Alkanes

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

sp³ d

sp³

sp²

57. 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

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

Ethyl hydrogen sulphate

Ethyl alcohol

Methyl alcohol

Methyl hydrogen sulphate

59. The active part in a molecule is called:

Homologous series

Functional group

Ionic complex

Chemical bonding

60. 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

Normal cracking

Stem cracking

Catalytic cracking

61. Which is the character of organic compounds

Mostly ionic in character

All

Rates of reactions are very fast

They possess particular properties

62. Hydrocarbons contain

C, H, O and N only

C and H only

C and S only

C, H, and O only

63. Normal by product of cracking is

Benzene

Butane

Ethane

All of these

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

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

Ammonium cyanate

Glucose

Methane

Urea

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

Petroleum

Natural gas

Coal

Wood

67. Either show the phenomenon of

Metamerism

Position isomerism

Functional group isomerism

Cis-trans isomerism

68. C₄H₈ can show isomerism

Position

Functional group

Geometric

Structural

69. 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

Ethane

Ethene

70. Methane is produced when aluminum carbide is treated with

Alcohol

Water

Base

Acid

71. The characteristic reactions of alkanes are

Condensation reactions

Substitution reactions

Polymerization

Addition reactions

72. In catalytic cracking, the typical catalyst used is

Al₂O₃

SiO₂+Al₂O₃

SiO₂

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

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

Sulphonation

Acylation

Nitration

Alkylation

75. The demand of gasoline can be fulfilled by

Reforming

Cracking

Vapourization

Crystallization

Page 4 of 5

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

Acetylene

Benzene

Ethanoic acid

Ethane

77. The carbocyclic compounds are those which have

May be other atoms

All atoms in the ring are carbon

All atoms are SP³ -hybridized

All atoms are SP² -hybridized

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

120° only

90° and 180°

45° and 90°

90° and 120°

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

Enantiomers

Diastereomers

Conformers

Positional isomers

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

Oxidation

Cracking

Reforming process

Hydrogenation

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

Condensation

Cracking

Polymerization

Isomerization

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

NO₂¯ - trigonal palnar

ClO₃¯-tetrahedral

SO₃²¯ - pyramidal

ClO₄¯ - tetrahedral

83. Which of the following possess linear geometry

Alkyne

Alkene

Benzene

Alkane

84. 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

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

None of these

Homocyclic

Monocyclic

Heterocyclic

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

Sigma bond is broken

None of these

Both bonds are broken

Pi bond is broken

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

Ionic properties

Carbon forming long chain or rings

Isomerism

Chemical forces

88. 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

89. The structure of benzene is

Pyramidal

Tetrahedral

Hexagonal

Square planer

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

SiCl₆²¯ -trigonal bipyramidal

PH₄⁺ - tetrahedral

ClO₂ - angular

NH₄⁺ - tetrahedral

91. Petroleum is mainly a mixture of

Saturated hydrocarbons

Phenols

Compounds of S

Unsaturated hydrocarbon

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

sp³

sp³d

sp²

93. An isomer of ethanol is:

Diethyl ether

Dimethyl ether

Acetone

Methanol

94. Which statement is true regarding reactivity?

Towards the addition reaction alkenes are more reactive than alkynes

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

Alkenes do not undergo addition reactions

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

H₂O – tetrahedral

CF₄ - tetrahedral

PF₃ - pyramidal

NH₃ - tetrahedral

96. Ether shows the phenomenon of

Cis – trass isomerism

Metamerism

Chain isomerism

Position isomerism

97. C₂H₂Cl₂ can show isomerism

Position

Geometric

Metamerism

Functional group

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

Alkane

Benzene

Alkyne

Alkene

99. 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

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

Ethane

Methane

Butane

Propane

Page 5 of 5

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

0, 3

1, 2

2, 1

3, 0

102. The open chain organic compounds are called

Aromatic

Aliphatic

Linear compounds

Both A and B

103. 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

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

Wood

Peat

Coal tar

Antheracite

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

NH₃

H₂O

CH₄

CO₂

106. 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

107. The state of hybridization carbon in ethane is

None

SP³

SP²

108. Polythene is a polymer of

Acetone

Propylene

Ethane

Ethene

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

Sugar industry

Bake bricks

Domestic use

In glass industry

110. 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

111. Hybridization explain the ________ of orbitals

Type of Bonding

Shapes

None of these

Shape and Type of bonding

112. The number of isomers of C₆H₁₄ is:

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

Isomerisation

Hybridization

Carbonization

Polymerization

114. Which one has zero octane number?

iso – octane

n – Hexane

decane

n – Heptane

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

The molecule is symmetrical around C – C

It is less stable

It is more stable

The molecule is asymmetrical around C – C bond

116. Which one is not an organic compound

Fats

Cyanides

Carbohydrates

None of these

117. Wholer prepared urea from

Uric acid

NH₃

Ammonia

NH₄CNO

118. Geometry of simple molecule having sp3 hybrid orbital is

Tetrahedral

Square planner

Linear

Triangular

119. The functional group isomer of dimethyl –ether is

Diethyl pether

Butyl alcohol

Ethyl alcohol

Prophyl alcohol

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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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