Bottles containing $C_6H_5I$ and $C_6H_5CH_2I$ lost their original labels. They were labelled $A$ and $B$ for testing. $A$ and $B$ were separately taken in a test tube and boiled with $NaOH$ solution. The end solution in each tube was made acidic with dilute $HNO_3$ and then some $AgNO_3$ solution was added. Substance $B$ gave a yellow precipitate. Which one of the following statements is true for this experiment?
- A$A$ was $C_6H_5I$
- B$A$ was $C_6H_5CH_2I$
- C$B$ was $C_6H_5I$
- DAddition of $HNO_3$ was unnecessary
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