Which halogen is known to cause the reaction given below?

Question

Canvas Classes · Accepted Answer

Concept: Reducing power of halides

In this reaction,  (+7) is reduced to  (+6), and  is oxidised to .

For the reaction to proceed, the halide must be a stronger reducing agent than .

Standard reduction potentials ():
- :  V
- :  V →  can reduce  ✓
- :  V →  cannot ✗
- :  V →  cannot ✗

Reducing power:

Only  is a strong enough reducing agent to convert permanganate to manganate.

Answer: Option (3) — Only Iodine

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