10. Select the most stable conformation of those sho 8. Which of the following statements is true concerning the isomers cis-1,2-dimethylcyclohexane and cis-1,3- dimethylcyclohexane? 1-tert-butyl-3,5-dimethylcyclohexane. (a) CH3 (b) CH3 CHg (a) They are not constitutional isomers. C(CH3)3 (b) They are conformers. (c) The favored conformer of the 1,3-isomer is more stable than that of the 1,2-isomer. (CH3)gC CH3 (c) (d) CH3 (d) The favored conformer of the 1,3-isomer and that of the CH3 CH3 (CH3)3C 1,2-isomer are equal in energy. (CH3)3C (e) The relative stability of the two molecules cannot be CH3 predicted. (e) (CH3)sC. CH3 9. Select the correct order of stability (least stable - most CH3 stable) for the following conformations. (b) H. (a) CH,CH3 CH3 H. CH3 H. H CH CH3 CH3 CH (c) H. CH CH CH CH
Carbohydrates
Carbohydrates are the organic compounds that are obtained in foods and living matters in the shape of sugars, cellulose, and starch. The general formula of carbohydrates is Cn(H2O)2. The ratio of H and O present in carbohydrates is identical to water.
Starch
Starch is a polysaccharide carbohydrate that belongs to the category of polysaccharide carbohydrates.
Mutarotation
The rotation of a particular structure of the chiral compound because of the epimerization is called mutarotation. It is the repercussion of the ring chain tautomerism. In terms of glucose, this can be defined as the modification in the equilibrium of the α- and β- glucose anomers upon its dissolution in the solvent water. This process is usually seen in the chemistry of carbohydrates.
L Sugar
A chemical compound that is represented with a molecular formula C6H12O6 is called L-(-) sugar. At the carbon’s 5th position, the hydroxyl group is placed to the compound’s left and therefore the sugar is represented as L(-)-sugar. It is capable of rotating the polarized light’s plane in the direction anticlockwise. L isomers are one of the 2 isomers formed by the configurational stereochemistry of the carbohydrates.
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