Which one of the following statements is correct?

Bottles containing C₆H₅l and C₆H₅CH₂I lost their original labels. They were labelled A and B for testing A and B were separately taken in test tubes and boiled with NaOH solution. The end solution in each tube was made acidic with dilute HNO₃ and then some AgNO₃ solution was added. Substance B gave a yellow precipitate. Which one of the following statements is true for this experiment?

Among the following four structures $$i$$ to $$iv,$$



it is true that

The reduction in atomic size with increase in atomic number is a characteristic of elements of