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Question: Best method of preparing alkyl chloride is....

Best method of preparing alkyl chloride is.

A

ROH+SOCl2→ 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6muROH + SOCl_{2}\overset{\quad\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\quad}{\rightarrow}

B

ROH+PCl5→ 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6muROH + PCl_{5}\overset{\quad\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\quad}{\rightarrow}

C

ROH+PCl3→ 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6muROH + PCl_{3}\overset{\quad\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\quad}{\rightarrow}

D

ROH+HCl→anhy. ZnCl2ROH + HCl\overset{\quad\text{anhy. }ZnCl_{2}\quad}{\rightarrow}

Answer

ROH+SOCl2→ 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6mu 6muROH + SOCl_{2}\overset{\quad\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\mspace{6mu}\quad}{\rightarrow}

Explanation

Solution

The chlorination of alcohol by SOCl2SOCl_{2} (thionyl chloride) is the best method for the preparation of alkyl halides as in this method all the other product are gaseous and thus halides are obtained on quite pure state.

R−OH+SOCl2→ΔR−Cl+HCl↑+SO2↑R - OH + SOCl_{2}\overset{\quad\Delta\quad}{\rightarrow}R - Cl + HCl \uparrow + SO_{2} \uparrow