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Answer :
In the compound name 'dl-stilbene dibromide,' the notation 'dl' refers to the presence of both enantiomers, or optical isomers, in a racemic mixture.
Here's a breakdown of what this means:
Enantiomers: These are molecules that are mirror images of each other but cannot be superimposed onto each other, like your left and right hands. They often have the same chemical structure and physical properties, except for how they interact with polarized light and other chiral molecules.
Racemic Mixture: A racemic mixture contains equal amounts of both enantiomers. The 'dl' stands for 'dextro' and 'levo.' 'Dextro' (d or +) indicates the enantiomer that rotates plane-polarized light to the right, while 'levo' (l or -) is the enantiomer that rotates light to the left.
Why It Matters: In chemistry, especially in organic and pharmaceutical chemistry, the specific arrangement of atoms in enantiomers can lead to vastly different biological activities. For instance, one enantiomer might be therapeutic, while the other could be inactive or even harmful.
In stereochemistry, 'dl-' is used when both enantiomers are present in 50:50 mixtures. Each substance has unique interactions and significance in chemical reactions or applications, thus 'dl' is important to note in the naming convention.
In summary, 'dl' in 'dl-stilbene dibromide' indicates that the compound is a mixture of both enantiomers and could have different reactivities and properties than if it were purely one enantiomer.
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