iGCSE Chemistry - Organic 2

Alcohols, acids, esters and condensation polymers. (Not Double Science - Chemistry iGCSE Only)

Q1-3 Ethanol is manufactured in industry by reacting ethene with steam in the presence of a catalyst. The equation for this reaction is:

CH₂=CH₂ + H₂O → CH₃CH₂OH

1. What type of reaction is the reaction between ethene and steam?

A. addition
B. substitution
C. combustion
D. oxidation

2. The name of the catalyst used in this process is ….

A. yeast
B. iron
C. concentrated phosphoric acid
D. potassium dichromate(VI)

3. The temperature and pressure used in this process is ….

	Temperature (°C)	Pressure (atm)
A	300	60-70
B	300	10-20
C	30	60-70
D	30	10-20

4. The products formed in the complete combustion of ethanol are …

A. carbon monoxide and hydrogen
B. carbon monoxide and water
C. carbon dioxide and hydrogen
D. carbon dioxide and water

5. Glucose can be fermented both in the presence and in the absence of air producing different products. Select the main organic product produced in each case:

	In the presence of air	In the absence of air
A	ethanol	Ethanoic acid
B	ethanol	ethene
C	Ethanoic acid	ethanol
D	Ethanoic acid	ethene

Q6-7: Ethanol is oxidized to compound Y when heated with potassium dichromate(VI) in dilute sulfuric acid.

6. The name of compound Y is …

A. carbon dioxide
B. ethene
C. ethyl ethanoate
D. ethanoic acid

7. The colour change in the potassium dichromate(VI) during this reaction is …

A. from orange to colourless
B. from orange to green
C. from green to colourless
D. from green to orange

8. CH₃OH, C₂H₅OH and C₃H₇OH are the first three members of the alcohol family. Deduce the general formula for the family of alcohols:

A. C_nH_2n-1OH
B. C_nH_2nOH
C. C_nH_2n+1OH
D. C_nH_2n+2OH

9. The structural formula of ethanoic acid is …..

A. CH₃CH₂OH
B. CH₃COOH
C. HCOOCH₃
D. C₂H₄O₂

10. Ethanoic acid reacts with sodium carbonate to produce the gas…..

A. ammonia
B. hydrogen
C. oxygen
D. carbon dioxide