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A chemist analysed a mixture of four dyes, A, B, C and D, using gas-liquid chromatography - Scottish Highers Chemistry - Question 16 - 2023
Question 16
A chemist analysed a mixture of four dyes, A, B, C and D, using gas-liquid chromatography. The time taken to travel through the column (retention time) depends on th... show full transcript
Worked Solution & Example Answer:A chemist analysed a mixture of four dyes, A, B, C and D, using gas-liquid chromatography - Scottish Highers Chemistry - Question 16 - 2023
Step 1
Which of the following compounds corresponds to peak Z?
Answer
To determine which compound corresponds to peak Z, we need to analyze the retention times of the dyes A, B, C, and D based on their polarities.
Peak Z appears earlier than the other peaks, indicating it is the least polar among the compounds. Consequently, among the structures provided:
- Dye A features multiple hydroxyl groups, suggesting higher polarity.
- Dye B has fewer hydroxyl groups compared to Dye A and could be less polar.
- Dye C also has multiple hydroxyls, increasing its polarity.
- Dye D has the most hydroxyl groups, leading to the highest polarity.
Analyzing these structures, Dye B appears to have the right configuration to reflect low polarity, corresponding with peak Z on the chromatogram.