Question

The structure types of B10H10 2- and B10H14 respectively, are

• A. closo and nido
• B. nido and arachno
• C. nido and closo
• D. closo and arachno

Answer 1

The Correct Option is A

The problem asks about the structure types of the given boron hydride compounds B₁₀H₁₀^2- and B₁₀H₁₄. Let's analyze their structures:

1. B₁₀H₁₀^2-: This compound is classified as a "closo" borane. "Closo" indicates that the boron framework is a closed, polyhedral cluster. Closo-boranes have the general formula [B_nH_n]^2-, with B₁₀H₁₀^2- specifically being a pentagonal antiprism.
2. B₁₀H₁₄: This compound is termed a "nido" borane. "Nido" means 'nest-like', indicative of an open polyhedral cluster. Nido-boranes follow the general formula B_nH_n+4, with B₁₀H₁₄ having this structure type, resembling a pentagonal pyramid with one open face.

Based on this understanding:

• The structure type of B₁₀H₁₀^2- is closo.
• The structure type of B₁₀H₁₄ is nido.

Therefore, the correct answer is closo and nido.