Q53 · CSIR NET Chemistry, December 2011
Paper: CSIR NET December 2011 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Boranes Carboranes · Marks: 2 · Difficulty: Easy
The correct statement regarding closo-$\{\mathrm{B_nH_n}\}$ species is:
(a)it always has a $2^{-}$ charge
(b)it always has a $2^{+}$ charge.
(c)it is a neutral species
(d)it is more reactive than nido, arachno, and hypo-boranes
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
closo-Boranes need n + 1 skeletal pairs, which for BₙHₙ requires two extra electrons: they exist only as [BₙHₙ]²⁻ dianions, and are the least reactive class.
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