State the reagents and conditions for the formation of an aldehyde, starting from a primary-alcohol.
Answer: Heat with acidified potassium dichromate (IV), distilling off the aldehyde as it forms.
Explanation: To form an aldehyde from an alcohol the alcohol group must be oxidised. To do this we use potassium dichromate (IV) acidified by dilute sulfuric acid. We also need to heat the reaction mixture to overcome the activation energy required for the reaction. However, we do not want to heat under reflux else the once the aldehyde is formed it will be oxidised further to form a carboxyllic acid. Instead, we distill off the aldehyde product as it is formed.
TO
Related Chemistry A Level answers
All answers ▸Explain how a buffer solution controls pH
Phosphorus(III) chloride molecules are pyramidal with a bond angle less than 109.5°. Explain why a phosphorus(III) chloride molecule has this shape and bond angle.
How does increasing the temperature affect the yield of products of a reaction at equilibrium, where the forward reaction is exothermic?
Explain the trend in ionisation energy down group 2? (3)