HardChemistryHigh School (11–12)Organic Compounds with Functional Groups › Alcohols, Phenols and EthersNumerical
Ethanal can be made from ethanol in two ways…
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Ethanal can be made from ethanol in two ways. Way 1: . Way 2: over hot copper. Use for ethanol, for potassium dichromate, for sulphuric acid and for ethanal. Find the total mass of the reactants in way 1, and the atom economy of each way.
Need a reminder? The key ideaShow
Dichromate takes 6 electrons. Ethanol to ethanal: 3 ethanol per dichromate. To ethanoic acid: 3 ethanol per 2 dichromate. products. Atom economy . NaBH reduces C=O of aldehydes and ketones. LiAlH also reduces esters and acids.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. The two balanced equations.
Step 1. Reactants in way 1. .
Step 2. Product in way 1. of ethanal. Atom economy: .
Step 3. Way 2. One reactant of and one wanted product of : .
Check. The oxidising agent and the acid, which have large molar masses, end up as waste in way 1. In way 2 the only waste is hydrogen, which is itself useful.
Answer: , and .
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