Long Answer Type
Short Answer TypeLong Answer TypeName the theory responsible for the definite geometry of covalent molecules. Give main features of the theory ?
Short Answer TypeWhat do you mean by Regular geometry and Irregular or Distorted geometry?
Regular geometry: The molecules in which the central atom is surrounded only by similarly bonded electron pairs will have regular geometries. The central atom should have no lone pair of electrons and should be bonded to all similar atoms. For example CH4, CCl4, BF3 etc.
Irregular or Distorted geometry: The molecules in which the central atom is surrounded by bond pairs, as well as lone pairs, will have irregular geometries. The central atom may be bonded to similar atoms but should have different bond lengths.
For example, CHCl3, CHBr3, PF5.
How will you explain the following order of the repulsive interactions between pair of electrons on the central atom:
Lone pair - Lone pair > Lone pair - Bond pair > Bond pair - Bond pair.
Long Answer TypeOn the basis of VSEPR theory, discuss the geometry of the following covalent molecules: (i) BeF2 (ii) BF3 (iii) CH4.
Short Answer TypeAlthough geometries of NH3 and H2O molecules are distorted tetrahedral, the bond angle in water is less than that of ammonia. Discuss.
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