What is the best choice of reagent to perform the following transformation?

Question

Quizplus · Accepted Answer

The transformation involves replacing a hydroxyl group with a chloro group, also known as a dehydration reaction. The best reagent for this type of transformation is thionyl chloride (SOCl2) which converts the hydroxyl group to a chloro group efficiently and selectively. Therefore, choice C is the best option. Furthermore, NaCl and HCl are not plausible options as they are not reagents that can perform the given transformation. Choice D is not a valid compound.

What Is the Best Choice of Reagent to Perform the Following