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.
Which of the attached molecules can hydrogen bond to another
molecule like itself?
Given:-
Which of the attached molecules can hydrogen bond to another molecule like itself?
Solution:-
The hydrogen bond has the electrostatic dipole - dipole interaction.
It forms between the molecules when the hydrogen is attached to the electro negative atom like nitrogen, oxygen and fluorine. And the negative atom or ions should have the extra electron density to make a hydrogen bond.
There is no possibility of hydrogen bond formation with another molecule with the structure of the compounds.
Hydrogen is not attached to an electro negative element. It is bonding with the another molecule of this compound is not possible.
A.
Diagram C 
Now consider the structure of the compound B and D then the hydrogen bonding is possible between the same molecule.
B DIAGRAM
Hydrogen is not attached to an electro negative element. That is nitrogen and it is bonding with the another molecule of this compound is possible. 
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