His question has multiple parts. work all the parts to get the most points. one method for preparing a nitrile is the dehydration of a primary amide. provide the mechanism for the reaction below: reaction a use curved arrows to show the mechanism of the step below. make the ends of your arrows specify the origin and destination of reorganizing electrons.

Following reaction shows the preparation of Nitrile from Amide. In this reaction Thionyl chloride is reacted with Amide, which produced nitrile along with SO₂ and HCl gas. The importance of this reaction is the removal of byproducts (i.e SO₂ and HCl). As both SO₂ and HCl are gases so no extra workup is required to remove them. The mechanism of reaction is as follow,

The answer is d.potassium