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Bonding

Bonding . Intermolecular forces. Kinds of molecules. Proof for existence of intermolecular forces. Types of Intermolecular forces. Examples to explain Van der waals ’ forces. Examples to explain dipole-dipole forces . Hydrogen bonding. H δ + — F δ - ---------------H δ + — F δ -

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Bonding

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  1. Bonding Intermolecular forces

  2. Kinds of molecules

  3. Proof for existence of intermolecular forces

  4. Types of Intermolecular forces

  5. Examples to explain Van der waals’ forces

  6. Examples to explain dipole-dipole forces

  7. Hydrogen bonding • Hδ+— Fδ- ---------------Hδ+— Fδ- • hydrogen bond • Considerably stronger than other intermolecular forces. • Affects the physical properties of the compounds in which it exists.

  8. Examples of H-Bonding

  9. Hydrogen Bonding in diff. compounds

  10. Examples of H-Bonding contd….

  11. Examples of H-Bonding contd….

  12. Trends in Boiling points of Groups 4,5,6 and 7

  13. Examples of H-Bonding contd….

  14. Anomalous behavior of Water

  15. Structure of ICE

  16. Hydrogen Bonds in Water, Ice

  17. Compare H2O and H2S

  18. Effect of H bonding on Organic compounds- case 1

  19. Dimer of Ethanoic acid

  20. Effect of H bonding on Organic compounds- case 2 • Propanone is miscible in water but it has no H bonding between propanone molecules • This is because its O atoms can bond to water molecules.

  21. Effect of H bonding on Organic compounds- case 3 • p- nitro phenol or 4- nitro phenol is having intermolecular H bonds , stronger forces of interaction between molecules and so its BP is 279°C • o- nitro phenol or 2- nitro phenol has intramolecular H bonds, weaker forces of interaction between molecules and so has lower BP of 216°C

  22. Biological importance of H bonding • DNA pairing occurs due to H bonds. • Secondary structure of proteins (α helix andβ pleated proteins) • α helix-is an example of INTRA MOLECULAR H Bonding

  23. Hydrogen bonds in DNA Base Pairs 2 H bonds between Adenine and Thymine 3 H bonds between Cytosine and Guanine

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