The reactivity of the halogen atom is minimum in:

The major product in the given reaction is:

The rate of $S_{N}1$ reaction for the given compounds is:

Identify $Z$ in the following series of reactions:

Two bottles containing $C_6H_5I$ and $C_6H_5CH_2I$ have lost their original labels. They are labeled as $A$ and $B$ for testing. $A$ and $B$ are taken separately in test tubes and boiled with $NaOH$ solution. The final solution of each test tube is acidified with dilute $HNO_3$ and a little $AgNO_3$ is added. Solution $B$ gives a yellow precipitate. Which of the following statements is correct?

Which of the following is least reactive towards $SN^{1}$ reactions?