Fructose: Structure and Characteristics

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Questions and Answers

What is the molecular formula of fructose?

C6H14O6
C6H12O6 (correct)
C6H10O6
C5H10O5

What type of functional group is present at carbon number 2 in fructose?

Carboxylic acid
Alcohol
Aldehyde
Keto (correct)

In what configuration is the hydroxyl group on carbon 1 positioned in alpha-D-(−)-fructofuranose?

Below the plane of the ring (correct)
Not attached to the ring
In the plane of the ring
Above the plane of the ring

What is the shape of the cyclic forms of fructose?

<p>Five-membered ring (furanose) (B)</p> Signup and view all the answers

Which of the following statements about fructose is false?

<p>Fructose is a straight-chain structure only. (D)</p> Signup and view all the answers

Flashcards

Fructose

An important monosaccharide, a type of sugar, found naturally in fruits, honey, and vegetables. It can be used as a sweetener.

Ketohexose

A type of sugar with a ketone group and six carbons.

Fructofuranose

A cyclic form of fructose, a five-membered ring.

Anomers (alpha and beta)

Different cyclic forms of fructose that differ in the arrangement of hydroxyl groups around the ring.

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Molecular formula of Fructose

C6H12O6

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Study Notes

Fructose

Fructose is a ketohexose, a monosaccharide found in fruits, honey, and vegetables
It's obtained along with glucose during sucrose hydrolysis
Its molecular formula is C₆H₁₂O₆
It has a ketone functional group at carbon 2 and six carbons in a straight chain
It belongs to the D-series and is a levorotatory compound, written as D-(−)-fructose
It exists in two cyclic forms (furanose)
These forms are created by adding an -OH group at carbon 5 to the C=O group
A furanose is a five-membered cyclic compound similar to furan (which contains one oxygen and four carbons)
Two anomers of fructose exist: α-D-(−)-fructofuranose and β-D-(−)-fructofuranose
These are represented by Haworth structures.

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Description

Explore the unique properties of fructose, a ketohexose monosaccharide found in fruits and honey. Learn about its molecular structure, cyclic forms, and the anomers that represent its distinct configurations. This quiz delves into the chemical and structural aspects of fructose.