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Out of the following reagents, how many reagents
P can convert ( \( \mathrm{R} \mathrm{CH}_{2} \mathrm{OH} \) to \( \left.\mathrm{R} \mathrm{CH}_{2} \mathrm{Cl}\right) \).

W
\( \begin{array}{cccc}\mathrm{PCl}_{3} & \mathrm{PCl}_{5} & \mathrm{POCl}_{3} & \mathrm{SOCl}_{2} \\ \mathrm{I} & \mathrm{II} & \mathrm{III} & \mathrm{IV} \\ \mathrm{NaCl} & \mathrm{TsCl} & \mathrm{ZnCl} / \mathrm{HCl} & \mathrm{HCl} \\ \mathrm{V} & \mathrm{VI} & \mathrm{VII} & \text { VIII }\end{array} \)
(1) 7
(2) 6
(3) 5
(4) 4
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