Question
Download Solution PDFAccording to Wade's theory the anion [B12H12]2- adopts -
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
Wade's Rules
- Wade's rules help predict the shapes and structures of boranes and related clusters.
- According to Wade's rules:
- Closo-clusters have a general formula of [BnHn]2- and have a polyhedron shape.
- Nido-clusters have a general formula of [BnHn+4] and are derived from the closo-cluster by removing one vertex.
- Arachno-clusters are derived by removing two vertices from the closo structure, and have the general formula [BnHn+6].
- Hypo-clusters are obtained by removing more vertices and have varying structures.
EXPLANATION:
|
Boron Hydride |
Name |
No. of SEP |
Example |
|
B nHn+1 |
Closo |
n +1 |
B 6H62- |
|
B nHn+4 |
Nido |
n +2 |
B 2H6 , B5H9 |
|
B nHn+6 |
Arachno |
n +3 |
B 4H10 |
|
B nHn+8 |
Hypo |
n +4 |
B 5H12- |
- The anion [B12H12]2- exactly fits the closo structure definition according to Wade's theory.
- It is a closed polyhedral structure where the number of boron atoms equals the number of hydrogen atoms.
The correct answer is: 1) Closo - structure
Last updated on Jun 18, 2025
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