Which of the following is an example of tetrose?

Naturally-occurring tetroses are D-erythrose, D-threose, and D-erythrulose. The erythrose, C₄H₈O₄, is a tetrose with one aldehyde group.

How many D Aldotetroses are there?

There are 8 aldopentoses. Four belong to the D-series; four belong to the L-series. Their names are ribose, arabinose, xylose, and lyxose.

What is an example of Aldohexose?

Examples of aldohexoses are glucose, mannose, galactose, gulose, idose, talose, allose, and altrose. Glucose is a one of the products of photosynthesis in plants and other photosynthetic organisms. It also serves as an important metabolic intermediate of cellular respiration.

What are the 4 Ketohexoses?

Ketohexoses are six-carbon monosaccharides, which include fructose, psicose, sorbose, and tagatose.

How many chiral centers are in Aldotetrose?

two chiral centers The aldotetroses have two chiral centers (asymmetric carbon atoms) and so 4 different stereoisomers are possible.

Is dihydroxyacetone a Tetrose?

Glyceraldehyde and dihydroxyacetone are trioses (3-carbon atoms), ribose is a pentose (5-carbon atoms), while glucose, fructose, and galactose are hexoses (6-carbon atoms) (Fig. 18-1). … Glyceraldehyde is the smallest aldose, and dihydroxyacetone the smallest ketose.

How many Stereogenic centers can be found in an Aldotetrose?

Note that aldotetroses contain two nonequivalent stereogenic centers, so 2² = 4 stereoisomers are possible.

Is starch a Ketohexose?

Starch is a polysaccharide. Therefore the correct answer is an option (a) Fructose. Note: Some other examples of ketohexoses are sorbose, tagatose, etc. Examples of ketopentoses are ribulose, xylulose, etc.

How many stereoisomeric Aldohexoses are there?

The aldohexoses have four chiral centres for a total of 16 possible aldohexose stereoisomers (2⁴).

What is Aldo hexose?

Aldohexose: A monosaccharide whose molecular structure contains both an aldehyde (an aldose) and six carbons (a hexose).

What do you mean by aldohexose?

aldohexose. / (ˌældəʊˈhɛksəʊs, -əʊz) / noun. any aldose containing six carbon atoms, such as glucose or mannose.

What does a hexose look like?

In chemistry, a hexose is a monosaccharide (simple sugar) with six carbon atoms. The chemical formula for all hexoses is C₆H₁₂O₆, and their molecular weight is 180.156 g/mol. … The carbons are commonly numbered 1 to 6 starting at the end closest to the carbonyl.

How do you identify a ketohexose?

In its linear structure, a ketohexose contains the carbonyl carbon center at the position 2 or 3. Therefore, in the linear structure, a ketohexose contains three chiral centers and eight possible stereoisomers. This means four pairs of enantiomers are possible for this compound.

What does monosaccharide stand for?

simple sugar monosaccharide. / (ˌmɒnəʊˈsækəˌraɪd, -rɪd) / noun. a simple sugar, such as glucose or fructose, that does not hydrolyse to yield other sugars.

Is galactose a Ketopentose?

Glucose and galactose are both aldohexoses, while fructose is a ketohexose.

How many chiral centers are in Ketopentose?

two chiral centers Ketopentoses. The 2-ketopentoses have two chiral centers; therefore, four (2²) different stereoisomers are possible.

Is Aldotetrose a monosaccharide?

Aldotetrose: A monosaccharide having both an aldehyde (an aldose) and four carbons (a tetrose).

Which carbohydrate is an Aldotetrose?

D-Glucose D-Glucose is an aldohexose with four stereogenic centers stacked on top of one another. It is also referred to as dextrose, grape sugar, or blood sugar. …

# of carbon atoms	Aldose	Ketose
4	aldotetrose	ketotetrose
5	aldopentose	ketopentose
6	aldohexose	ketohexose

Is a triose a glyceraldehyde?

They are classified according to the number of carbon atoms in a monosaccharide. In particular, a triose is a monosaccharide with three carbon atoms. Two naturally occurring trioses are aldotriose (glyceraldehyde) and ketotriose (dihydroxyacetone).

Can Tetroses form ring structure?

The monosaccharides have been presented as open-chain compounds using the projection formulae (Figure 1.1) of Fischer. However, in solution, only the trioses and tetroses exist in appreciable quantities in this form. Pentoses and hexoses undergo cyclization, i.e. they form ring structures.

Is Glycerose a triose sugar?

Trioses: (C₃H₆O₃) Glycerose- has two isomers, glyceraldehyde, which contains an aldehyde group (-CHO) and dihydroxyacetone, which contains a ketone group (-C=0).

Is glucose a Ketopentose?

Ketopentose: Ketopentose is also a five-carbon monosaccharide which has a ketone group at position 2. So, as we have already mentioned above that glucose contains an aldehyde group, i.e. an aldose and six carbons, i.e. a hexose. Therefore, we can say that glucose is an example of aldohexose.

Is dihydroxyacetone a Ketopentose?

The “parent” ketose is the ketotriose called dihydroxyacetone. We can construct ketoses from dihydroxyacetone by consecutively inserting stereogenic centers (H—C—OH) between the ketone carbonyl carbon atom and the carbon atom directly below it.

What is a Ketopentose sugar?

ketopentose. Definition : A pentose having a single ketone group at the 2-position. pentose. Definition : A five-carbon monosaccharide which in its linear form contains either an aldehyde group at position 1 (aldopentose) or a ketone group at position 2 (ketopentose).

Is a mixture of amylose and amylopectin?

A mixture of amylose and amylopectin is called starch.

What are the 8 Aldohexoses?

Aldohexoses has eight D-aldohexoses namely, D-allose, D-altrose, D-glucose, D- mannose, D-glulose, D-iodose, D-galactose and D-talose. Out of the eight aldohexoses, D- glucose and D- galactose are the most important in the biological world.

What sugars are aldohexose?

8 Glucose. Glucose (also known as dextrose) is a carbohydrate compound consisting of six carbon atoms and an aldehyde group and they are referred to as aldohexose.

How many chiral carbons are in an aldohexose?

four chiral centres An aldohexose has four chiral centres. So there are 24=16 optical isomers.

How many hydroxyl groups are in an aldohexose?

in addition, all monosaccharides contain hydroxyl groups. what are the functional groupfs and numbers of carbons in a aldohexose? it has 6 carbons and several hydroxyl groups and and aldehyde goup.

Is mannose A hexose?

Mannose is a sugar monomer of the aldohexose series of carbohydrates.