Question

Q. Which type of boranes are
B5H9 and B4H10 respectively?
(a) Nido and Arachano boranes
(b) Nido and Closo boranes

(c) Closo and Arachano boranes
(d) Both are Nido boranes​

Answer 1

c is your answer mate..........

Answer 2

The correct answer is option (a) Nido and Arachano boranes.

Explanation:

• B5H9 and B4H10 are Nido and Arachano boranes respectively.
• The point of difference between closo nido and arachno boranes is that closo structure has n+1 skeletal bonding electron pairs, and nido structure has n+2 skeletal bonding electron pairs, whereas arachno structure has n+3 skeletal bonding electron pairs.
• The names of these structures depends on the wade rules.
• Thus, the correct answer is option a i.e Nido and Arachano boranes.