A) concentrated sulphuric acid
B) anhydrous calcium oxide
C) anhydrous aluminium chloride
D) phosphorus pentoxide
Correct Answer: D
Solution :
The dehydrating agent used in the conversion of acetic acid into acetic anhydride is \[{{\text{P}}_{\text{2}}}{{\text{O}}_{\text{5}}}\text{.}\] \[2C{{H}_{3}}COOH+{{P}_{2}}{{O}_{5}}\xrightarrow{{}}\underset{\begin{smallmatrix} \text{Acetic} \\ \text{anhydride} \end{smallmatrix}}{\mathop{{{(C{{H}_{3}}CO)}_{2}}O}}\,\] \[\underset{\begin{smallmatrix} \,\,\,\,\,\,\,\,\,\text{Meta} \\ \,\,\,\,\text{phosphoric}\,\text{acid} \end{smallmatrix}}{\mathop{+2HP{{O}_{3}}}}\,\]
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