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One test for glucose involves Fehling's solution - Scottish Highers Chemistry - Question 13 - 2015
Question 13
One test for glucose involves Fehling's solution. Circle the part of the glucose molecule that reacts with Fehling's solution. In solution, sugar molecules exist in... show full transcript
Worked Solution & Example Answer:One test for glucose involves Fehling's solution - Scottish Highers Chemistry - Question 13 - 2015
Step 1
Circle the part of the glucose molecule that reacts with Fehling's solution.
Answer
The part of the glucose molecule that reacts with Fehling's solution is the aldehyde group located at the end of the chain. In the structure of glucose, this is the carbon atom bonded to the hydroxyl (–OH) and a hydrogen atom, where the double bond to oxygen represents the carbonyl group.
Step 2
Draw the structure of a ring form for fructose.
Answer
The ring form of fructose is typically a five-membered ring (furanose). The structure can be drawn as follows:
O
/ \
H C1 C2
| \ /
H–C4 C3–OH
| \
H–C5
C=O
/ \\
H2O }
In this structure, the oxygen from the hydroxyl group on C5 creates a bond with C2, forming the cyclic structure.