Fundamental Principles of Organic Chemistry Online Mcqs Test

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Question 1

1. The demand of gasoline can be fulfilled by

Answer

Crystallization

Answer

Vapourization

Question 2

2. The number of isomers of C₆H₁₄ is:

Question 3

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

Answer

The same vapour density

Answer

The same viscosity

Answer

Different molecular weights

Answer

Same molecular weights

Question 4

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

Answer

Isomerisation

Answer

Carbonization

Answer

Polymerization

Answer

Hybridization

Question 5

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

Answer

-CHO group

Answer

- OH group

Answer

+NH₂ group

Answer

-CH₃ group

Question 6

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

Answer

Enantiomers

Answer

Conformers

Answer

Positional isomers

Answer

Diastereomers

Question 7

7. Either show the phenomenon of

Answer

Cis-trans isomerism

Answer

Metamerism

Answer

Functional group isomerism

Answer

Position isomerism

Question 8

8. The state of hybridization carbon in ethane is

Question 9

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

Answer

SO₃²¯ - pyramidal

Answer

NO₂¯ - trigonal palnar

Answer

ClO₄¯ - tetrahedral

Answer

ClO₃¯-tetrahedral

Question 10

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

Answer

Hydrogenation

Answer

Reforming process

Question 11

11. The active part in a molecule is called:

Answer

Homologous series

Answer

Ionic complex

Answer

Functional group

Answer

Chemical bonding

Question 12

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

Question 13

13. 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

Catalytic cracking

Answer

Thermal cracking

Answer

Normal cracking

Answer

Stem cracking

Question 14

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

Question 15

15. In which molecule carbon atom is sp² hybridized

Answer

None of these

Question 16

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

Question 17

17. Isomerism which is only found in alkanes?

Answer

cis – trans isomerism

Answer

Position isomerism

Answer

Metamerism

Answer

Functional group isomerism

Question 18

18. An isomer of ethanol is:

Answer

Diethyl ether

Answer

Dimethyl ether

Question 19

19. Which of the following species is planar?

Question 20

20. In benzene carbon – carbon bonds are

Answer

Double covalent

Answer

Single covalent

Answer

Of the order 1.5

Answer

3 single and 3 double

Question 21

21. C₄H₈ can show isomerism

Answer

Functional group

Answer

Structural

Question 22

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

Answer

None of these

Answer

Sigma bond is broken

Answer

Pi bond is broken

Answer

Both bonds are broken

Question 23

23. Vital force theory was rejected by

Question 24

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

Answer

It is more stable

Answer

It is less stable

Answer

The molecule is asymmetrical around C – C bond

Answer

The molecule is symmetrical around C – C

Question 25

25. Unsaturated hydrocarbons containing a double bond are called

Question 26

26. Ethyl alcohol on ____________ gives ethane

Answer

Dehydrogenation

Answer

Dehydration

Question 27

27. In catalytic cracking, the typical catalyst used is

Answer

SiO₂+Al₂O₃

Question 28

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

Answer

Alkylation

Answer

Sulphonation

Question 29

29. The essential component of organic compound is

Question 30

30. The perchloric acid molecule contains:

Answer

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

Answer

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

Answer

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

Answer

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

Question 31

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

Answer

Only HF and OF₂

Answer

All except SO₃

Answer

None of these

Question 32

32. Polythene is a polymer of

Question 33

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

Answer

Sulphonation

Answer

Alkylation

Question 34

34. A π (pi) bond is the result of the

Answer

Overlap of two p orbitals along their axes

Answer

Sidewise overlap of two parallel p orbitals

Answer

Overlap of two s orbitals

Answer

Overlap of an s and a p orbital

Question 35

35. Which statement is true regarding reactivity?

Answer

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

Answer

Alkenes do not undergo addition reactions

Answer

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

Answer

Towards the addition reaction alkenes are more reactive than alkynes

Question 36

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

Question 37

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

Question 38

38. 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 39

39. Organic compounds are soluble in all except

Question 40

40. Which molecule is nonpolar?

Question 41

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

Question 42

42. Rates of organic reactions are

Answer

None-reactive

Question 43

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

Answer

Hydrogen sulphides

Question 44

44. The carbocyclic compounds are those which have

Answer

All atoms are SP² -hybridized

Answer

May be other atoms

Answer

All atoms in the ring are carbon

Answer

All atoms are SP³ -hybridized

Question 45

45. Acetylene had a characteristic ethereal smell resembling that of

Question 46

46. Which of the following has linear shape?

Answer

None of these

Question 47

47. The characteristic reactions of alkanes are

Answer

Substitution reactions

Answer

Addition reactions

Answer

Condensation reactions

Answer

Polymerization

Question 48

48. In C₂H₂ carbon-carbon bond angle is

Question 49

49. Which is the solid form of petroleum?

Question 50

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

Answer

Position isomerism

Answer

Metamerism

Answer

Chain isomerism

Answer

Functional group isomerism

Question 51

51. The major portion of natural oil is

Question 52

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

Question 53

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

Answer

Methyl hydrogen sulphate

Answer

Ethyl hydrogen sulphate

Answer

Ethyl alcohol

Answer

Methyl alcohol

Question 54

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

Answer

Natural gas

Question 55

55. Alkanes cannot show cis-trans isomerism

Answer

The bond angle is 109.5°

Answer

0¯ bond is stronger than A-bond

Answer

Alkanes possess three groups attached to each carbon

Answer

0¯ bond required less energy to be rotated

Question 56

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

Answer

CF₄ - tetrahedral

Answer

NH₃ - tetrahedral

Answer

PF₃ - pyramidal

Answer

H₂O – tetrahedral

Question 57

57. Geometry of simple molecule having sp3 hybrid orbital is

Answer

Triangular

Answer

Square planner

Answer

Tetrahedral

Question 58

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

Answer

Methyl alcohol

Answer

Ethyl hydrogen sulphate

Answer

Ethyl alcohol

Answer

Methyl hydrogen sulphate

Question 59

59. C₂H₂Cl₂ can show isomerism

Answer

Functional group

Answer

Metamerism

Question 60

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

Answer

Tetrahedron

Question 61

61. The structure of benzene is

Answer

Square planer

Answer

Tetrahedral

Question 62

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

Question 63

63. Which one is not an organic compound

Answer

None of these

Answer

Carbohydrates

Question 64

64. Coal is obtained from dead remains of

Answer

Both a and b

Answer 127

C₂H₂Cl₂

Answer 128

Four p-orbitals are involved

Answer 129

All p-orbitals are involved

Answer 130

One s and 3 p-orbitals are involved

Answer 131

One p-orbital is involved

Answer 132

Three sigma and one Pi

Answer 133

Two sigma and two Pi

Answer 134

One sigma and three Pi

Answer 135

Hybrid orbitals

Answer 136

Hybrid and un hybrid orbitals

Answer 137

Atomic orbital and hybrid orbital

Answer 138

Un-hybrid orbitals

Answer 139

Sp-hybridization

Answer 140

Sp³-hybridization

Answer 141

Dsp²-hybridization

Answer 142

Sp²-hybridization

Answer 143

Having different chemical properties

Answer 144

Having different M.P.

Answer 145

Having different physical states

Answer 146

Having different B.P.

Answer 147

Ethanoic acid

Answer 148

In glass industry

Answer 149

Domestic use

Answer 150

Sugar industry

Answer 151

Bake bricks

Answer 152

CaSO₄. 0.5H₂O

Answer 153

(C₆H₁₀O₅)n

Answer 154

C₆H₁₂O₆

Answer 155

Antheracite

Answer 156

Saturated hydrocarbons

Answer 157

Unsaturated hydrocarbon

Answer 158

Compounds of S

Answer 159

Ammonium cyanate

Answer 160

Natural gas

Answer 161

Un-saturated

Answer 162

Para-magnetic

Answer 163

Reaction with alcoholic KOH

Answer 164

Reaction with aq KOH

Answer 165

Functional isomers

Answer 166

Position isomers

Answer 167

Chain isomers

Answer 168

Metamerism

Answer 169

Chain isomerism

Answer 170

Cis – trass isomerism

Answer 171

Position isomerism

Answer 172

Monocyclic

Answer 173

Heterocyclic

Answer 174

None of these

Answer 175

Homocyclic

Answer 176

1 band pair 3 lone pair

Answer 177

3 lone pair 1 bond pair

Answer 178

2 band pair 2 lone pair

Answer 179

3 band pair one lone pair

Answer 180

BF₃ - trigonal planar

Answer 181

AsF₅ - trigonal bipyramidal

Answer 182

H₂O - bent

Answer 183

NF₃ - trigonal planar

Answer 184

None of these

Answer 185

Catenation

Answer 186

Cyclohexanol

Answer 187

Anthracene

Answer 188

None of these

Answer 189

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

Answer 190

Not in a series

Answer 191

In which atoms of C are in a series

Answer 192

C₁₂H₂₆

Answer 193

C₉H₂₀

Answer 194

C₁₃H₂₈

Answer 195

C₁₁H₂₄

Answer 196

C, H, O and N only

Answer 197

C and H only

Answer 198

C, H, and O only

Answer 199

C and S only

Answer 200

Neo-octane

Answer 201

Neo-Pentane

Answer 202

Having different physical states

Answer 203

Having different M.P.

Answer 204

Having different chemical properties

Answer 205

Having different B.P.

Answer 206

Anthracite

Answer 207

Prophyl alcohol

Answer 208

Butyl alcohol

Answer 209

Diethyl pether

Answer 210

Ethyl alcohol

Answer 211

Rates of reactions are very fast

Answer 212

Mostly ionic in character

Answer 213

They possess particular properties

Answer 214

n – Hexane

Answer 215

n – Heptane

Answer 216

iso – octane

Answer 217

Chemical forces

Answer 218

Ionic properties

Answer 219

Carbon forming long chain or rings

Answer 220

90° and 120°

Answer 221

120° only

Answer 222

45° and 90°

Answer 223

90° and 180°

Answer 224

Isomerization

Answer 225

Condensation

Answer 226

Polymerization

Answer 227

Both A and B

Answer 228

Linear compounds

Answer 229

They form long chain compounds

Answer 230

Organic compound chain compounds

Answer 231

They exist in homologous series

Answer 232

Organic compounds are water soluble

Answer 233

Type of Bonding

Answer 234

None of these

Answer 235

Shape and Type of bonding

Answer 236

ClO₂ - angular

Answer 237

NH₄⁺ - tetrahedral

Answer 238

PH₄⁺ - tetrahedral

Answer 239

SiCl₆²¯ -trigonal bipyramidal

Answer 240

All of these

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