Q73 · CSIR NET Chemistry, December 2014
Paper: CSIR NET December 2014 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: 18 Electron Rule · Marks: 2 · Difficulty: Easy
According to Wade's rule, anion $\mathrm{C}_{2} \mathrm{B}_{9} \mathrm{H}_{12}$ adopts
(a)closo-structure
(b)nido-structure
(c)arachno-sturcture
(d)hypho-structure
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
[C₂B₉H₁₂]⁻: 11 vertices; skeletal electrons 2×3 + 9×2 + 1 (extra H) + 1 (charge) = 26 = 2n + 4 → nido (the dicarbollide precursor).
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