Punjab 12th Class Chemistry Chapter 8 Aliphatic Hydrocarbons Mcqs Test Online

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Question 1 of 20

Chemistry

1. In which one of the following compounds the benzene ring is isolated:

1.Naphtalene

2.Diphenyl methane

3.Phenanthrene

4.Anthracene

Question 1 of 20

Question 2 of 20

2. The marsh gas is:

1.Propane

2.Methane

3.Butane

4.Ethane

Question 2 of 20

Question 3 of 20

3. Acidic hydrogen is present:

1.Acetylene

2.Ethane

3.Benzene

4.Ethene

Question 3 of 20

Question 4 of 20

4. The molecule of ethane posses which hybridization:

1.sp²d

2.SP

3.Sp²

4.Sp³

Question 4 of 20

Question 5 of 20

5. The Sp³ hyrid orbitals are oriented in space at one angle.

1.109.5°

2.120°

3.180°

4.100°

Question 5 of 20

Question 6 of 20

6. Two compounds have the same composition and also have the same atoms attached to the same atoms, although with different orientations is space. These compounds are:

1.Structural

2.Identical

3.Position isomer

4.Stereoisomerism

Question 6 of 20

Question 7 of 20

7. Shao of benzene molecule is:

1.Linear planer

2.Pyramidal

3.Trigonal

4.Hyxagonal planer

Question 7 of 20

Question 8 of 20

8. Alkanes show geo-metrical isomers due to:

1.Asymmetry

2.Resonance

3.Restricted rotation around a double bond

4.Rotation around a single bond

Question 8 of 20

Question 9 of 20

9. A molecule is said to be chiral:

1.If it can be superimposed on its mirror image

2.If it cannot be superimposed to its mirror image

3.If it contains center of symmetry

4.If is contains plane of symmetry

Question 9 of 20

Question 10 of 20

10. The isomers of a substance must have:

1.Same chemical properties

2.Same structural formula

3.Same molecular weight

4.Same functional groups

Question 10 of 20

Question 11 of 20

11. Sodalime is:

1.KOH

2.CaO and NaOH

3.NaOH

4.Mixture of Na & Ca hydroxide

Question 11 of 20

Question 12 of 20

12. The conversion of n – hexane into benzene by heating in the presence of pt is called:

1.Rearrangement

2.Aromatization

3.Dealkylation

4.Isomerization

Question 12 of 20

Question 13 of 20

13. Benzene cannot undergo:

1.Oxidation

2.Addition

3.Subsitution

4.Elimination

Question 13 of 20

Question 14 of 20

14. Which reaction is used as test for the presence of alkane:

1.Combustion

2.Catalytic hydrogenation

3.Polymerization

4.Reaction of cold diluted alkaline KMnO₄

Question 14 of 20

Question 15 of 20

15. Ethanol and dimethyl ether are best considered.

1.Diastereomers

2.Stereoisomers

3.Enantiomers

4.Structural isomers

Question 15 of 20

Question 16 of 20

16. The electrophile in aromatic sulphonation is:

1.HSO⁻₄

2.H₂SO₄

3.SO⁻₄

4.SO₃

Question 16 of 20

Question 17 of 20

17. The geometry of acetylene is,

1.Bent

2.Angular

3.Trigonal

4.Linear

Question 17 of 20

Question 18 of 20

18. Catalyst used for friedal craft’s reaction is:

1.HNO₃

2.NaCl

3.AlCl₃

4.BeCl₃

Question 18 of 20

Question 19 of 20

19. The general formula of alkane is

1.CnH₂n₊₂

2.CnH₂

3.CnHn

4.CnH₂n

Question 19 of 20

Question 20 of 20

20. The benzene molecule contains:

1.Delocalized

2.Two double bonds

3.One double bond

4.Three double bonds

Question 20 of 20

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