Which of the following reactions are not feasible ?
`{:((a), Zn(s)+2Ag^(+)(aq) ,rarr,Zn^(2+)(aq)+2Ag(s)),((b),I_2(s)+2Br^(-)(aq) ,rarr,2I^(-)(aq)+Br_2),((c),2Fe^(3+)(aq)+2I^(-)(aq),rarr,I_2(aq)+2Fe^(2+)(aq)),((d),2Ag+2H^(+)(aq),rarr,H_2+2Ag^(+)(aq)):}`

Explanation

To determine which of the given reactions are not feasible, we will analyze each reaction based on the reactivity series of metals and the principles of oxidation and reduction.

### Step-by-step Solution:

1. **Reaction (a): Zn(s) + 2Ag⁺(aq) → Zn²⁺(aq) + 2Ag(s)**
- **Analysis**: Zinc (Zn) is more reactive than silver (Ag). According to the reactivity series, a more reactive metal can displace a less reactive metal from its compound. Here, Zn can displace Ag from Ag⁺ ions in solution.
- **Conclusion**: This reaction is feasible.

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