Bottles containing C₆H₅I and C₆H₅CH₂I lost their original labels. They were labeled as A and B respectively for testing. A and B were separately taken in a test tube and boiled with NaOH solution. The end solution in each test tube was made acidic with dilute HNO₃ and then some AgNO₃ was added. A substance present in test tube B gave a yellow precipitate. The true statement among the following regarding the experiment is:
1. A was C₆H₅I 
2. A was C₆H₅CH₂I 
3. B was C₆H₅I 
4. Addition of HNO₃ was unnecessary 

In which of the following S_N1 reaction is feasible?

1.
2.
3.
4.