Fundamental Principles of Organic Chemistry Online Mcqs Test

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Question 1

1. Which one has zero octane number?

Answer

n – Hexane

Answer

n – Heptane

Answer

iso – octane

Question 2

2. In which molecule carbon atom is sp² hybridized

Answer

None of these

Question 3

3. 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

Answer

Functional isomers

Answer

Chain isomers

Answer

Position isomers

Question 4

4. The structure of benzene is

Answer

Square planer

Answer

Tetrahedral

Question 5

5. The components of petroleum can be separated due to

Answer

Having different chemical properties

Answer

Having different B.P.

Answer

Having different M.P.

Answer

Having different physical states

Question 6

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

Answer

Chain isomerism

Answer

Metamerism

Answer

Functional group isomerism

Answer

Position isomerism

Question 7

7. Unsaturated hydrocarbons containing a double bond are called

Question 8

8. The open chain organic compounds are called

Answer

Both A and B

Answer

Linear compounds

Question 9

9. In C₂H₂ carbon-carbon bond angle is

Question 10

10. Which of the following species is planar?

Question 11

11. The active part in a molecule is called:

Answer

Functional group

Answer

Chemical bonding

Answer

Ionic complex

Answer

Homologous series

Question 12

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

Answer

H₂O - bent

Answer

NF₃ - trigonal planar

Answer

AsF₅ - trigonal bipyramidal

Answer

BF₃ - trigonal planar

Question 13

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

Question 14

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

Answer

Chemical forces

Answer

Ionic properties

Answer

Carbon forming long chain or rings

Question 15

15. Which is a mixture of low boiling hydrocarbon

Answer

Natural gas

Question 16

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

Answer

Organic compounds are water soluble

Answer

Organic compound chain compounds

Answer

They form long chain compounds

Answer

They exist in homologous series

Question 17

17. Pi bonds are produced by overlapping of

Answer

Un-hybrid orbitals

Answer

Atomic orbital and hybrid orbital

Answer

Hybrid and un hybrid orbitals

Answer

Hybrid orbitals

Question 18

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:

Answer

Stem cracking

Answer

Catalytic cracking

Answer

Thermal cracking

Answer

Normal cracking

Question 19

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

Answer

Alkylation

Answer

Sulphonation

Question 20

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

Answer

Diastereomers

Answer

Positional isomers

Answer

Conformers

Answer

Enantiomers

Question 21

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

Question 22

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

Answer

The molecule is symmetrical around C – C

Answer

The molecule is asymmetrical around C – C bond

Answer

It is more stable

Answer

It is less stable

Question 23

23. Which of the following is complex?

Answer

(C₆H₁₀O₅)n

Answer

CaSO₄. 0.5H₂O

Answer

C₆H₁₂O₆

Question 24

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

Answer

It is costly

Answer

It damages the engine

Answer

The combustion product, lead causes air pollution

Answer

Pb is difficult to obtain in bulk qualities

Question 25

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

Question 26

26. The major portion of natural oil is

Question 27

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

Answer

Anthracene

Answer

Cyclohexanol

Question 28

28. Hybridization explain the ________ of orbitals

Answer

None of these

Answer

Shape and Type of bonding

Answer

Type of Bonding

Question 29

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

Answer

Antheracite

Question 30

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

Answer

45° and 90°

Answer

90° and 120°

Answer

90° and 180°

Answer

120° only

Question 31

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

Answer

Natural gas

Question 32

32. Vital force theory was rejected by

Question 33

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

Answer

None of these

Answer

Monocyclic

Answer

Homocyclic

Answer

Heterocyclic

Question 34

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

Answer

Hydrogenation

Answer

Reforming process

Question 35

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

Answer

NH₃ - tetrahedral

Answer

CF₄ - tetrahedral

Answer

H₂O – tetrahedral

Answer

PF₃ - pyramidal

Question 36

36. Petroleum is mainly a mixture of

Answer

Compounds of S

Answer

Saturated hydrocarbons

Answer

Unsaturated hydrocarbon

Question 37

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

Answer

None of these

Answer

Pi bond is broken

Answer

Both bonds are broken

Answer

Sigma bond is broken

Question 38

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

Question 39

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

Question 40

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

Question 41

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

Answer

None of these

Answer

All except SO₃

Answer

Only HF and OF₂

Question 42

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

Answer

Condensation

Answer

Polymerization

Answer

Isomerization

Question 43

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

Answer

Polymerization

Answer

Isomerisation

Answer

Carbonization

Answer

Hybridization

Question 44

44. The demand of gasoline can be fulfilled by

Answer

Vapourization

Answer

Crystallization

Question 45

45. The carbocyclic compounds are those which have

Answer

All atoms in the ring are carbon

Answer

May be other atoms

Answer

All atoms are SP² -hybridized

Answer

All atoms are SP³ -hybridized

Question 46

46. Rates of organic reactions are

Answer

None-reactive

Question 47

47. 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

Answer

Three sigma and one Pi

Answer

One sigma and three Pi

Answer

Two sigma and two Pi

Question 48

48. Linear shape is shown by which compound

Answer

C₂H₂Cl₂

Question 49

49. Alkanes cannot show cis-trans isomerism

Answer

0¯ bond required less energy to be rotated

Answer

The bond angle is 109.5°

Answer

Alkanes possess three groups attached to each carbon

Answer

0¯ bond is stronger than A-bond

Question 50

50. Bromoethane can be converted to ethane by

Answer

Reaction with alcoholic KOH

Answer

Reaction with aq KOH

Question 51

51. Peat before conversion to bituminous coal is converted to

Answer

Anthracite

Question 52

52. Which of the following possess linear geometry

Question 53

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

Question 54

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

Question 55

55. Which of the following contains single bonds?

Question 56

56. The functional group isomer of dimethyl –ether is

Answer

Ethyl alcohol

Answer

Diethyl pether

Answer

Butyl alcohol

Answer

Prophyl alcohol

Question 57

57. Either show the phenomenon of

Answer

Position isomerism

Answer

Metamerism

Answer

Cis-trans isomerism

Answer

Functional group isomerism

Question 58

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

Answer

Ammonium cyanate

Question 59

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

Answer

Hydrogen sulphides

Question 60

60. The octane number is 100 for

Answer

Neo-Pentane

Answer

Neo-octane

Question 61

61. The essential component of organic compound is

Question 62

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

Answer

1 band pair 3 lone pair

Answer

2 band pair 2 lone pair

Answer

3 lone pair 1 bond pair

Answer

3 band pair one lone pair

Question 63

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

Question 64

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

Answer 133

Different molecular weights

Answer 134

Same molecular weights

Answer 135

The same viscosity

Answer 136

The same vapour density

Answer 137

NO₂¯ - trigonal palnar

Answer 138

ClO₄¯ - tetrahedral

Answer 139

ClO₃¯-tetrahedral

Answer 140

SO₃²¯ - pyramidal

Answer 141

Methyl hydrogen sulphate

Answer 142

Methyl alcohol

Answer 143

Ethyl alcohol

Answer 144

Ethyl hydrogen sulphate

Answer 145

-CH₃ group

Answer 146

+NH₂ group

Answer 147

- OH group

Answer 148

-CHO group

Answer 149

Metamerism

Answer 150

Functional group

Answer 151

Having different chemical properties

Answer 152

Having different physical states

Answer 153

Having different M.P.

Answer 154

Having different B.P.

Answer 155

Sulphonation

Answer 156

Alkylation

Answer 157

Metamerism

Answer 158

Position isomerism

Answer 159

Chain isomerism

Answer 160

Cis – trass isomerism

Answer 161

All of these

Answer 162

NH₄⁺ - tetrahedral

Answer 163

ClO₂ - angular

Answer 164

PH₄⁺ - tetrahedral

Answer 165

SiCl₆²¯ -trigonal bipyramidal

Answer 166

Para-magnetic

Answer 167

Un-saturated

Answer 168

Diethyl ether

Answer 169

Dimethyl ether

Answer 170

None of these

Answer 171

Substitution reactions

Answer 172

Condensation reactions

Answer 173

Polymerization

Answer 174

Addition reactions

Answer 175

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

Answer 176

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

Answer 177

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

Answer 178

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

Answer 179

3 single and 3 double

Answer 180

Of the order 1.5

Answer 181

Double covalent

Answer 182

Single covalent

Answer 183

Triangular

Answer 184

Square planner

Answer 185

Tetrahedral

Answer 186

Ethanoic acid

Answer 187

All p-orbitals are involved

Answer 188

Four p-orbitals are involved

Answer 189

One p-orbital is involved

Answer 190

One s and 3 p-orbitals are involved

Answer 191

Methyl alcohol

Answer 192

Ethyl hydrogen sulphate

Answer 193

Methyl hydrogen sulphate

Answer 194

Ethyl alcohol

Answer 195

Sp³-hybridization

Answer 196

Sp-hybridization

Answer 197

Dsp²-hybridization

Answer 198

Sp²-hybridization

Answer 199

Both a and b

Answer 200

Tetrahedron

Answer 201

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

Answer 202

In which atoms of C are in a series

Answer 203

None of these

Answer 204

Not in a series

Answer 205

Dehydrogenation

Answer 206

Dehydration

Answer 207

Functional group

Answer 208

Structural

Answer 209

Catenation

Answer 210

None of these

Answer 211

Bake bricks

Answer 212

Domestic use

Answer 213

In glass industry

Answer 214

Sugar industry

Answer 215

None of these

Answer 216

Carbohydrates

Answer 217

SiO₂+Al₂O₃

Answer 218

C and S only

Answer 219

C, H, and O only

Answer 220

C, H, O and N only

Answer 221

C and H only

Answer 222

Functional group isomerism

Answer 223

cis – trans isomerism

Answer 224

Metamerism

Answer 225

Position isomerism

Answer 226

Overlap of an s and a p orbital

Answer 227

Sidewise overlap of two parallel p orbitals

Answer 228

Overlap of two s orbitals

Answer 229

Overlap of two p orbitals along their axes

Answer 230

Mostly ionic in character

Answer 231

Rates of reactions are very fast

Answer 232

They possess particular properties

Answer 233

C₁₃H₂₈

Answer 234

C₁₁H₂₄

Answer 235

C₁₂H₂₆

Answer 236

C₉H₂₀

Answer 237

Towards the addition reaction alkenes are more reactive than alkynes

Answer 238

Alkenes do not undergo addition reactions

Answer 239

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

Answer 240

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

Total Questions:	119
Time Allowed:	60 Minutes
Total Marks:	119
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