MCQ
A carboxylic acid is converted into its anhydride using
- AThionyl chloride
- BSulphur chloride
- CSulphuric acid
- ✓Phosphorus pentoxide
$\begin{array}{*{20}{c}}
{RCOOH} \\
{RCOOH}
\end{array}\,\xrightarrow{{{P_2}{O_5}}}$ $\begin{array}{*{20}{c}}
{RCO} \\
{RCO}
\end{array} > O + {H_2}O$
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Assertion $A:$ $3.1500\,g$ of hydrated oxalic acid dissolved in water to make $250.0\,mL$ solution will result in $0.1\,M$ oxalic acid solution.
Reason $R:$ Molar mass of hydrated oxalic acid is $126\,g\,mol ^{-1}$.
In the light of the above statements, chose the correct answer from the options given below:

$(1)$ $BeCl _2, CO _2, BCl _3, CHCl _3$
$(2)$ $SO _2, C _6 H _5 Cl , H _2 Se , BrF _5$
$(3)$ $BF _3, O _3, SF _6, XeF _6$
$(4)$ $NO _2, NH _3, POCl _3, CH _3 Cl$