carbon compund

1. What is the general formula of alkanes?

A C_nH_2n

B C_nH_2n+2

C C_nH_2n+1OH

D C_nH_2n+1COOH

2. Which of the following statement is the physical property of alcohol?

A It smells like vinegar.

B It is soluble in water.

C It conducts electricity.

D It has high boiling point.

3. A structural formula is the chemical formula that shows the

A simplest ratio of elements in a molecule.

B number of moles of element in a molecule.

C actual number of each type of element in a molecule.

D presence of each type of element and how the atoms of the elements in a molecule are bonded.

4. What is meant by unsaturated hydrocarbons?

A Organic compounds containing carbon and hydrogen only.

B Hydrocarbons contain at least one carbon-carbon double bond.

C Hydrocarbons consist of entirely of carbon-carbon single bonds.

D Organic compounds in which some or all of the hydrogen atoms can be replaced by other atoms.

5. Which of the following statement is not true about the members of a homolog series?

A They have the same functional group.

B They exhibit the same physical properties.

C They exhibit the same chemical properties.

D They can be represented by a general formula.

6. Which of the following is a natural polymer?.

A Polyethene

B Polystyrene

C Polypropene

D Polyisoprene

7. The equation shows an esterification reaction.

CH₃OH + CH₃COOH CH₃COOCH₃ + H₂O

What is the function of concentrated sulphuric acid in producing methyl ethanoate?

A To dry the ethanol.

B To speed up the reaction.

C To absorb water produced.

D To increase the temperature of the reaction.

8. The empirical formula of a hydrocarbon is CH₂. Its relative molecular mass is 56. What is the molecular formula of the hydrocarbon?

[Relative atomic mass: H, 1; C, 12 ]

A C₃H₈

B C₄H₈

C C₄H₁₀

9. Acidic properties of carboxylic acids are due to the presence of

A carbon group

B carboxyl group

C functional group

D carbon-carbon double bond

10. All members of a homologous series have similar

A structural formula

B molecular formula

C physical properties

D chemical properties

11. Explain why combustion of hexene, C₆H₁₂ produce more soot than hexane, C₆H₁₄.

[Relative atomic mass: H,1; C,12]

12. Draw the structural formulae for the organic compounds below:

(a) n-butane, C₄H₁₀

(b) pent-2-ene, C₅H₁₀

(c) propan-1-ol, C₃H₇OH

(d) propanoic acid, C₂H₅COOH

(e) ethyl ethanoate, CH₃COOC₂H₅

13. Organic compounds are classified into different

A group

B period

C chemical reaction

D homologous series

14. Which of the following is a homologous series?

A Alcohol

B Halogen

C Noble gas

D Alkali metal

15. The equation represents the combustion of propanol in excess oxygen.

2C₃H₇OH(l) + 9O₂(g) à 6CO₂(g) + 8H₂O(l)

From the equation above, 2 moles of propanol produce 6 moles of carbon dioxide gas. What is the volume of carbon dioxide gas that is produced at room conditions when 0.2 mol of propanol is heated in excess oxygen?

[1 mol of any gas occupies 24dm³ at room conditions]

A 4.8 dm³

B 7.2 dm³

C 14.4 dm³