Saved Bookmarks
| 1. |
Define hydrogen hond : Is it weaker or stronger than the van der Waals forces ? |
|
Answer» Solution :Definition : Nitrogen, oxygen an fluorine are the HIGHLY electonegative elements. When they are attached to hydrogen ATOM to form covalent bond the ELECTRONS for the covalent bond are shifted towards the more electronegative atom. "This partially positively charged hydrogen atom `(H^(+ delta))`forms a bond with the other more electronegative atom. This bond is known as hydrogen bond." In short : Hydrogen bond`H^(+ delta) .... X^(- delta)` (where, X = N , O , F , Cl etc. ) it is represented by a dotted line. Definition : Hydrogen bond can be defined as the attractive force which binds hydrogen atom of one molecule with the electronegative atom (F, O, N or Cl) of another molecule. Normally van der Waals FORCES are weak than hydrogen bond. Bond energy of Hydrogen bond is 40 kJ `mol^(-1)` while van der Waals forces are less strong than 10 kJ `mol^(-1)` . |
|