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NEET CHEMISTRYEasy

Mark the correct order of repulsion among the following according to the VSEPR theory.

A

lone pair-lone pair > bond pair-bond pair > lone pair-bond pair

B

bond pair-bond pair > lone pair-bond pair > lone pair-lone pair

C

lone pair-bond pair > bond pair-bond pair > lone pair-lone pair

D

lone pair-lone pair > lone pair-bond pair > bond pair-bond pair

Step-by-Step Solution

  1. Postulate of VSEPR Theory: The Valence Shell Electron Pair Repulsion (VSEPR) theory states that electron pairs surrounding the central atom repel one another and move as far apart as possible to minimize repulsion .
  2. Difference in Electron Pairs: While lone pairs are localised on the central atom, each bonded pair is shared between two atoms. Consequently, lone pair electrons occupy more space than bonding pair electrons .
  3. Order of Repulsion: Due to the spatial difference, the repulsion is greatest between two lone pairs and least between two bond pairs. The decreasing order of repulsive interaction is: Lone pair (lp) - Lone pair (lp)>Lone pair (lp) - Bond pair (bp)>Bond pair (bp) - Bond pair (bp)\text{Lone pair (lp) - Lone pair (lp)} > \text{Lone pair (lp) - Bond pair (bp)} > \text{Bond pair (bp) - Bond pair (bp)} .
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