
Concept explainers
Interpretation:
The reason why molecular structure of some molecules is different from the structure given by arrangement of electron pairs is to be written.
Concept introduction:
To determine the shape of molecule, the total number of bonding and non-bonding pairs is to be calculated for the central atom. Then these are arranged in a shape so that electron- electron repulsions are minimum.

Answer to Problem 3RQ
The molecular structure for a molecule is different from the arrangement of electron pairs when central atom has non- bonding pairs of electrons.
Explanation of Solution
According to VSEPR theory, lone pair-lone pair repulsions are maximum. If in a molecule central atom has lone pair of electrons then its structure will be little different from the structure suggested by arrangement of electron pairs.
Example:
Ammonia has pyramidal shape although it has 4 pairs of electrons around nitrogen.
Thus, if there is presence of non-bonding electrons, the structure will be different from the structure as given by arrangement of electron pairs.
Chapter 12 Solutions
World of Chemistry, 3rd edition
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