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The ion that cannot undergo disproportio...

The ion that cannot undergo disproportionation is :

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Three diastereomers:

(B) does not react. Therefore, the vicinal `H` atom on each side is vicinal. And `H` and `Cl` are cis or syn (for elimination, `H` and `Cl` should be trans or anit-complanar). Both `(A)` and `(C)` react because `H` and `Cl` are anit-co[,amar.
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