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The species which does not undergo disproportionation reaction is: (1) ClO2− (2) ClO4− (3) ClO− (4) ClO3−

1. ClO2−
2. ClO4−
3. ClO−
4. ClO3−

Correct answer: ClO4−

Solution

ClO4−, or perchlorate, is a highly stable ion with chlorine in its highest oxidation state of +7, making it unlikely to undergo disproportionation, which typically occurs in species where the central atom can exist in multiple oxidation states.

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