Chirality: why these molecules are not chiral?

In summary, the first two pairs of compounds are not chiral because they do not have a chiral carbon. A molecule can still be chiral without a chiral carbon, as long as it is not superimposable on its mirror image. The last pair of compounds is chiral because it cannot be superimposed on its mirror image. This can be confirmed by making mirror images and attempting to superimpose them mentally.
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tsuwal
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Homework Statement


Look at the image please. The image shows 3 pairs of compounds. Explain why the first two are not chiral but the last one is chiral.

Sem Título.jpg


Homework Equations



Ar means Aromatic ring

Aquirais means aquiral
Quirais means chiral


The Attempt at a Solution



A chiral carbon is linked to four different groups of atoms. However, this doesn't happen in any of them.
 
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A chiral molecule need not have a chiral carbon..morever a molecule having more than one chiral carbons may not be chiral...The only necessary condition for a molecule to be chiral is non superimposability on its mirror image...try making mirror images of the given compounds and try to superimpose them on each other using your mind...this method works well for such simple compounds
 
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Thanks!
 

1. What is chirality?

Chirality is a property of certain molecules that have a non-superimposable mirror image. This means that the molecules are asymmetric and cannot be rotated or flipped to match their mirror image.

2. Why are some molecules chiral while others are not?

Chirality is determined by the arrangement of atoms around a central carbon atom. When there are four different groups attached to the carbon, the molecule is chiral. If there are two or more of the same groups attached, the molecule is not chiral.

3. How does chirality affect the properties of a molecule?

Chirality can greatly impact a molecule's properties, including its biological activity and how it interacts with other molecules. This is because the two chiral forms, called enantiomers, can have different chemical and physical properties.

4. What are some examples of chiral molecules?

Some common examples of chiral molecules include amino acids, sugars, and certain drugs. These molecules play important roles in biological processes and can have different effects depending on their chirality.

5. Can chirality be changed in a molecule?

No, chirality is a fixed property of a molecule and cannot be changed. However, some reactions can produce a mixture of both chiral forms, known as a racemic mixture, which can be separated into individual enantiomers.

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