Q53 · CSIR-NET Chemistry, December 2015
Paper: CSIR-NET December 2015 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Chemistry – General · Marks: 2 · Difficulty: Easy
The correct statement for Mn-O bond lengths in $\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$, is
(a)all bonds are equal
(b)four bonds are longer than two others
(c)two bonds are longer than four others
(d)they are shorter than the $\mathrm{Mn}-\mathrm{O}$ bond in $\left[\mathrm{MnO}_{4}\right]^{-}$
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
High-spin Mn(II) d⁵ (⁶A₁g) is not Jahn–Teller active: all six Mn–O bonds are equal (and longer than in MnO₄⁻).
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