Worksheet carbon

 Here are 20 MCQs on carbon and related topics:

1. Which property of carbon allows it to form four covalent bonds?

a) Valency

b) Tetravalency

c) Trivalency

d) Monovalency

2. Carbon forms how many covalent bonds in a methane (CH₄) molecule?

a) 2

b) 3

c) 4

d) 5

3. What term describes a molecule that contains only single bonds between carbon atoms?

a) Saturated

b) Unsaturated

c) Aromatic

d) Polar

4. Which of the following is an example of an alkane?

a) Ethene

b) Ethane

c) Propyne

d) Butyne

5. Which compound is an alkene?

a) Methane

b) Propane

c) Ethene

d) Ethyne

6. Which hydrocarbon contains a triple bond?

a) Propane

b) Ethene

c) Ethyne

d) Butane

7. What is the molecular formula of methane?

a) CH₄

b) C₂H₆

c) C₄H₁₀

d) C₃H₆

8. What kind of bond exists between the carbon atoms in ethene?

a) Single

b) Double

c) Triple

d) None

9. What is the general formula for alkenes?

a) CnH₂n+₂

b) CnH₂n

c) CnH₂n-2

d) CnH₃n

10. Which of the following hydrocarbons is unsaturated?

a) Methane

b) Ethane

c) Propene

d) Butane

11. Which element forms the backbone of organic molecules?

a) Hydrogen

b) Nitrogen

c) Oxygen

d) Carbon

12. What is the molecular formula of butyne?

a) C₄H₆

b) C₄H₈

c) C₄H₁₀

d) C₄H₅

13. What is the valency of carbon?

a) 1

b) 2

c) 3

d) 4

14. Which of the following compounds is saturated?

a) Ethene

b) Ethyne

c) Butane

d) Propyne

15. The ability of carbon to form long chains of atoms is called:

a) Catenation

b) Carnation

c) Hybridization

d) Isomerization

16. What type of bonds are present in alkanes?

a) Single bonds

b) Double bonds

c) Triple bonds

d) Ionic bonds

17. What is the IUPAC name of C₂H₂?

a) Ethane

b) Ethene

c) Ethyne

d) Propene

18. Which property of carbon allows it to form a large number of compounds?

a) Low valency

b) Catenation and tetravalency

c) High reactivity

d) High electronegativity

19. Which is the simplest alkane?

a) Ethene

b)

 Methane

c) Propene

d) Butyne

20. How many bonds are formed between carbon atoms in a molecule of ethyne?

a) 1

b) 2

c) 3

d) 4

Here are the answers to the 20 MCQs:

1. b) Tetravalency

2. c) 4

3. a) Saturated

4. b) Ethane

5. c) Ethene

6. c) Ethyne

7. a) CH₄

8. b) Double

9. b) CnH₂n

10. c) Propene

11. d) Carbon

12. a) C₄H₆

13. d) 4

14. c) Butane

15. a) Catenation

16. a) Single bonds

17. c) Ethyne

18. b) Catenation and tetravalency

19. b) Methane

20. c) 3

Let me know if you need further clarifications!