What are the reagent and reaction conditions used for converting ethyl chloride to ethyl nitrite (as the major product) ?

Potassium nitrite converts ethyl chloride into ethyl nitrite.

Potassium nitrite is the inorganic chemical. It is an ionic salt of potassium ions and nitrite ions that dissolves in water and forms a white or slightly yellow hygroscopic crystalline powder. It is a powerful oxidant and may hasten the combustion of other materials.

The reaction,

${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Cl}+{\mathrm{KNO}}_2\underset{\Delta }{\stackrel{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{⟶}}{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{ONO}$

Hence, the correct answer is option (A) ${\mathrm{KNO}}_2, {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}, {\mathrm{H}}_2\mathrm{O}, \Delta$