\( 3^{\circ} \) Alcohol Con. HCl \( \rightarrow \) imm anhydride Znd \( _{2} \) of \( \frac{ Con \cdot HCl }{\text { anhydride } ZMCl _{2}} \) Tw
\( 2^{\circ} \) Alcohol \( \frac{ Con \cdot HCl }{\text { anhydride } ZCl _{2}} \) \( \pm^{\circ} \) Alcohol con. \( HCl \) emhyduide \( ZMCl _{2} \)
action with Phosphorus halide :
