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Cuprous compounds such as CuCl, CuCN and CuSCN are the only salts stable in water due to:

1. high hydration energy of Cu^+ ions
2. their inherent tendency to not disproportionate
3. diamagnetic nature
4. insolubility in water

Correct answer: their inherent tendency to not disproportionate

Solution

Cuprous compounds like CuCl, CuCN, and CuSCN are stable in water because they resist disproportionation, which is a common tendency of Cu+ ions in aqueous solutions. This stability arises from their lattice energy and low solubility.

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