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A partially completed reaction pathway for the synthesis of the painkiller ibuprofen is given below - VCE - SSCE Chemistry - Question 8 - 2009 - Paper 1
Question 8
A partially completed reaction pathway for the synthesis of the painkiller ibuprofen is given below. ![reaction pathway image] **reagent A** **compound 1** **... show full transcript
Worked Solution & Example Answer:A partially completed reaction pathway for the synthesis of the painkiller ibuprofen is given below - VCE - SSCE Chemistry - Question 8 - 2009 - Paper 1
Step 1
Step 2
ii. In the appropriate box, complete the structure for compound 1.
Answer
Compound 1 is completed by adding a hydroxyl group (-OH) to the structure next to the benzene ring. The full structure of compound 1 can be written as:
![structure of compound 1]
It consists of a propyl group on one side of the benzene and a hydroxyl group on the adjacent carbon.
Step 3
iii. Write a balanced half-equation for the reduction of dichromate ions to Cr³⁺ ions in an aqueous acid solution.
Answer
The balanced half-equation for the reduction of dichromate ions ext{(Cr}_2 ext{O}_7^{2-}) to chromium ions ext{(Cr}^{3+}) in an acidic solution is:
ightarrow 2 ext{Cr}^{3+}(aq) + 7H_2O(l)$$