Question
Question: In addition to a ketone group, fructose contains:...
In addition to a ketone group, fructose contains:
A
One secondary and four primary OH groups
B
One primary and four secondary OH groups
C
Two primary OH and three secondary OH groups
D
Three primary OH and two secondary OH groups
Answer
Two primary OH and three secondary OH groups
Explanation
Solution
Fructose is a ketohexose. Its open-chain structure reveals a ketone group at C2. The hydroxyl groups are located at C1, C3, C4, C5, and C6. C1 and C6 are primary alcohols as their carbons are bonded to only one other carbon. C3, C4, and C5 are secondary alcohols as their carbons are bonded to two other carbons. Therefore, fructose contains two primary and three secondary hydroxyl groups.