1. Provide the product of the following reaction. propanal + S S || SH HO SH 'S H₂SO4 ||| SH Raney OH Ni S IV SH V 2. Refer to the structures below. Which are L-sugars? но- CHO HO-HI H-OH H-OH CH₂OH II B) I, II, and III D) III, IV, and V E) IV and V CHO H-OH H-OH H+OH CH₂OH I A) A) II and IV CHO н+он HO-H н+он CH₂OH III C) I and V CHO H-OH H-OH HO-H CH₂OH IV CHO H-OH H-OH HO-H CH₂OH V
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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S
propanal +
S S. S
11
SH SH
مله
HO
H₂SO4
SH
Raney
Ni
OH
S
IV
SH
2. Refer to the structures below. Which are L-sugars?
CHO
H-OH
H-OH
H-OH
CH₂OH
I
A) A) II and IV
CHO
H-OH
H-OH
H-OH
CHO
H-OH
HO-H
CH₂OH
II
B) I, II, and III
D) III, IV, and V E) IV and V
H-OH
CH₂OH
III
CHO
HO-H
C) I and V
H-OH
но-н
CH₂OH
IV
CHO
НО
H-OH
H-OH
HO-H
CH₂OH
V"
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