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.
i. In the appropriate box, writ... 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
i. In the appropriate box, write the formula for reagent A.
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Answer
Reagent A is likely to be sodium hydroxide (NaOH) or potassium hydroxide (KOH), as it is commonly used in reactions involving nucleophilic substitutions. Therefore, the formula for reagent A is:
Reagent A: NaOH
Step 2
ii. In the appropriate box, complete the structure for compound 1.
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Answer
Compound 1 can be derived from the starting material by replacing the Cl atom with a hydroxyl group (–OH) to form an alcohol. The structure of compound 1 is as follows:
CH3
|
CH3-CH-CH-OH
|
C6H5
This represents a compound where the hydroxyl group is attached to the second carbon of the chain.
Step 3
iii. Write a balanced half-equation for the reduction of dichromate ions to Cr$^{3+}$ ions in an aqueous acid solution.
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Answer
The balanced half-equation for the reduction of dichromate ions ( ext{Cr}_2 ext{O}_7^{2-}) to Cr3+ ions in an acidic solution can be written as:
