Chiral carbon is a carbon in a carbohydrate chain that does not have a repetitive of 2 or more of same atom bind to it chain
In the above diagram it will be observed that there is no repetition of any atom attached to the carbon in the chains, in this case the above compound is said to be chiral compound and the carbon is said to be chiral carbon.
In another way when a carbon chain have a repetitive atom attached to it carbon chain, it said not to be chiral carbon but amino acid. It am amino acid is a bimolecular chemistry compound that have a repetitive atom attached to it carbon chain, see bellow chain of non chiral carbon, amino acid.
In the above diagram it could found that there is a repetition of hydrogen atom attached to the carbon chain, with this repetition of hydrogen atom in the above diagram, it render the compound non chiral but amino acid.
In consideration of chiral carbon the letter preceding the name of L-sugar that is attached to the chiral carbon is point out to the left, on this case we draw a fiscal projection formula for the compound (L- levorotatory).
On the other hand D-sugar means that the hydrogen atom attached on the chiral carbon point out to the right (D-dextrorotatory).
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