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Oils contain carbon to carbon double bonds which can undergo addition reactions with iodine - Scottish Highers Chemistry - Question 8 - 2015
Question 8
Oils contain carbon to carbon double bonds which can undergo addition reactions with iodine. The iodine number of an oil is the mass of iodine in grams that will re... show full transcript
Worked Solution & Example Answer:Oils contain carbon to carbon double bonds which can undergo addition reactions with iodine - Scottish Highers Chemistry - Question 8 - 2015
Step 1
Which line in the table shows the oil that is likely to have the lowest melting point?
Answer
In general, oils with higher iodine numbers contain more unsaturated fatty acids, which tend to have lower melting points due to the presence of double bonds. This results in a less stable structure compared to saturated fats.
From the table:
- Corn has an iodine number of 123
- Linseed has an iodine number of 179
- Olive has an iodine number of 81
- Soya has an iodine number of 130
Thus, the oil with the highest iodine number is Linseed, indicating it is the most unsaturated and therefore likely to have the lowest melting point.
Thus, the correct answer is B. Linseed.