The strongest nucleophile in a polar protic solvent is:

What is the product formed when chloroform reacts with zinc dust in the presence of water?

Write a note on nucleophilic substitution 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?

The reaction of $4-methylcyclohexyl$ halide with $OH^-$ via the $S_N2$ mechanism produces $A$. Identify $A$.

Which of the following compounds will show retention in configuration on nucleophilic substitution by $OH^{-}$ ion?