Chirality: why these molecules are not chiral?

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SUMMARY

The discussion centers on the concept of chirality in molecules, specifically addressing why two compounds are not chiral while the third is. A chiral carbon must be bonded to four distinct groups, which is not the case for the first two compounds presented. The key takeaway is that chirality is defined by non-superimposability on a mirror image, rather than the presence of a chiral carbon alone. This understanding is crucial for analyzing molecular structures in organic chemistry.

PREREQUISITES
  • Understanding of chirality and its definition in organic chemistry
  • Familiarity with the concept of chiral and achiral molecules
  • Knowledge of molecular structures and bonding
  • Ability to visualize molecular mirror images
NEXT STEPS
  • Study the concept of stereoisomerism in organic compounds
  • Learn about the Cahn-Ingold-Prelog priority rules for assigning R/S configurations
  • Explore the implications of chirality in pharmaceuticals and biological systems
  • Investigate the methods for determining chirality using spectroscopy techniques
USEFUL FOR

Chemistry students, organic chemists, and anyone interested in molecular structure and stereochemistry will benefit from this discussion.

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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