Which statements is correct for the conversion of P \( \mathrm{ROH}...
0Which statements is correct for the conversion of
P \( \mathrm{ROH} \) to \( \mathrm{RX} \) by reagents (1) \( \left(\mathrm{SOCl}_{2}, \mathrm{PBr}_{3}, \mathrm{PCl}_{3}, \mathrm{PI}_{3}\right. \)
W and \( \mathrm{TsCl}) \) compared to using \( \mathrm{HX} \) ?
(1) No rearrangement occurs with predictable stereo-chemistry by reagent (1)
(2) Reagent (1) are not useful for \( 3^{\circ} \) alcohols, while \( \mathrm{HX} \) reacts easily with \( 3^{\circ} \) alcohols involving no rearrangement.
(3) Reagents (1) must be used in anhydrous conditions because all react vigorously with \( \mathrm{H}_{2} \mathrm{O} \) and they produce harmful gases \( \left(\mathrm{SO}_{2}\right. \), \( \mathrm{HCl}, \mathrm{HBr} \) and \( \mathrm{HI} \) )
(4) All of the above
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