The alcohols form a homologous series. The first four members are methanol, ethanol, propan-1-ol and butan-1-ol. One characteristic of a homologous series is that the physical properties vary in a predictable way. The table below gives the heats of combustion of the first three alcohols.
Describe two other characteristics of homologous series.
Important Questions on Cambridge IGCSE Exam Questions from Paper 3
Methanol is made from carbon monoxide.
The forward reaction is exothermic.
Which condition, high or low pressure, would give the maximum yield of methanol? Give a reason for your choice.
For each of the following predict the name of the organic product.
(i) reaction between methanol and ethanoic acid.
For each of the following predict the name of the organic product.
(ii) oxidation of propan-1-ol by potassium dichromate(VI)
(iii) removal of H2O from ethanol (dehydration).
Complete the following table :
| gas | test for gas |
| ammonia | |
| bleaches damp litmus paper | |
| hydrogen | |
| relights a glowing splint | |
| turns limewater milky |
