HardChemistryHigh School (11–12)Organic Compounds with Functional Groups › Alcohols, Phenols and EthersNumerical
A student brominates 5.41 g of anisole in ethanoic acid…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A student brominates of anisole in ethanoic acid. The total yield of bromoanisoles is and of that, is the para isomer and is the ortho isomer, by amount. Use for anisole and for a bromoanisole. Find the total amount of bromoanisoles, and the masses of the para and the ortho isomer.
Need a reminder? The key ideaShow
One mole of an ideal gas occupies : at and . The lower flammable limit of ether vapour is by volume. A titration gives moles of thiosulphate, and two thiosulphate ions react with each . An activating group directs to the ortho and para carbons.
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. anisole, total yield, para to ortho.
Step 1. Total. . Times : .
Step 2. Para. . Mass: .
Step 3. Ortho. . Mass: .
Check. The para isomer is the major product, because the ortho position is crowded by the OCH group. The two masses add to , which is .
Answer: , and .
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