Doc: Carbohydrates and their Classification Class 12 Notes | EduRev

Chemistry Class 12

Created by: Mohit Rajpoot

Class 12 : Doc: Carbohydrates and their Classification Class 12 Notes | EduRev

The document Doc: Carbohydrates and their Classification Class 12 Notes | EduRev is a part of the Class 12 Course Chemistry Class 12.
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CARBOHYDRATES:

1. Introduction:

Carbohydrates received their name becasue of their general formula Cx(H2O)y, according to which they appear to be hydrates of carbon.

xCO2 +  yH2Doc: Carbohydrates and their Classification Class 12 Notes | EduRev Cx(H2O)y +  xO2

Photosynthesis:

6CO2 + 6H2O+ 18 ATP Doc: Carbohydrates and their Classification Class 12 Notes | EduRev C6H12O6 + 6O2

Cellular Respiration:

C6H12O6  +6ODoc: Carbohydrates and their Classification Class 12 Notes | EduRev 6CO2  +6H2O +38 ATP (36 ATP net gain)

2. Classification and structure of Carbohydrates:

Carbohydrates are polyhydroxy aldehydes and ketones and substances which hydrolyse to polyhydroxy aldehydes and ketones.

The simplest carbohydrates are called sugars or saccharides, (Latin: Saccharum, sugar). Carbohydrates can be classified as monosaccharides, oligosaccharides and polysaccharides.

3. General Characteristic of Monosaccharides:

The important characteristics of monosaccharides as follows:

(i) All monosaccahrides are water soluble due to the presence of hydrogen bonding between the different OH groups and surrounding water molecules.

(ii) Monosaccharides have sweet taste and dependent upon heating they get charred and give the smell of burning sugar.

(iii) Monosaccharides are optically active in nature due to the presence of chiral carbon atoms.

(iv) The chemical characteristics of monosaccharides are due to OH groups and carbonyl group which may be either aldehydic or ketonic group.

Glyceraldehyde contains one asymmetric carbon atom (marked by an astrisk) and can thus exist in two optically active forms, called the D-form and the L-form. Clearly, the two forms are mirror images that cannot be superimposed, that is they are enantiomers.

Doc: Carbohydrates and their Classification Class 12 Notes | EduRev   Doc: Carbohydrates and their Classification Class 12 Notes | EduRev

Doc: Carbohydrates and their Classification Class 12 Notes | EduRev   Doc: Carbohydrates and their Classification Class 12 Notes | EduRev

All four isomers have been prepared synthetically. The D-and L-erythrose are mirror images, that is, they are enantiomers. They have exactly the same degree of rotation but in opposite directions. Equal amounts of the two would constitute a racemic mixture, that is a mixture that would allow a plane-polarised light to pass through the solution unchanged.

Doc: Carbohydrates and their Classification Class 12 Notes | EduRev

Supplying hydrogen atoms to the five carbon atoms to satisfy their tetravalency, following structure (open chain) may be assigned to glucose: (* indicates assymetric carbon atom).

Doc: Carbohydrates and their Classification Class 12 Notes | EduRev

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