Using Wade's rules predict the structure type of [C₂ B₅ H₇]

Q75 · CSIR-NET Chemistry, December 2015

Paper: CSIR-NET December 2015 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Cluster Compounds Wade Rules · Marks: 2 · Difficulty: Easy

Using Wade's rules predict the structure type of $\left[\mathrm{C}_{2} \mathrm{B}_{5} \mathrm{H}_{7}\right]$

(a)nido

(b)closos

(c)arachno

(d)hypho

Answer

Answer: B ✓ checked by 4AB · confidence high

Explanation

C₂B₅H₇: 7 vertices; skeletal electrons 2×3 (CH) + 5×2 (BH) = 16 = 8 pairs = n + 1 → closo (pentagonal bipyramid).

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