$Cl_2$ reacts with $CS_2$ in the presence of an $I_2$ catalyst to form:

$2$-Bromobutane is obtained by the reaction of:

Identify $X$ and $Y$ in the following reaction:
$CH_2=CH_2 \xrightarrow[(i) X]{(ii) Y} CH_3CH_2I$

Assertion : Alkyl iodide can be prepared by treating alkyl chloride/bromide with $NaI$ in acetone.
Reason : $NaCl/NaBr$ are soluble in acetone while $NaI$ is not.

Write about the Finkelstein and Swarts reactions.

Ethanol is converted to chloroethane by reaction with . . . . . . .