In the following reaction $C_{6}H_{5}CH_{2}Br \xrightarrow[(ii)H_{3}O^{+}]{(i)Mg, \text{Ether}} X$
Product $X$ is

Identify compound $Y$ in the following reaction.
$C_2H_5Cl + Y \xrightarrow{\Delta} C_2H_5CN$

The major product obtained in the following reaction is:

Pure $CHCl_3$ and pure $CHI_3$ can be distinguished by which of the following?

$A$ bottle containing $C_6H_5I$ and $C_6H_5CH_2I$ has lost its label. To identify them,samples $A$ and $B$ are taken in separate test tubes and boiled with $NaOH$ solution. Finally,the solution in each test tube is acidified with dilute $HNO_3$ and then a few drops of $AgNO_3$ solution are added. Substance $B$ gives a yellow precipitate. Which statement is correct for this process?

Which of the following reactions is an example of a nucleophilic substitution reaction?