The vapour of a carboxylic acid $HA$ when passed over $MnO_2$ at $573 \ K$ yields propanone. The acid $HA$ is

The weakest acid among the following is

Order of hydrolysis for the following:
$I$. $RCOCl$
$II$. $RCOOR$
$III$. $RCONH_2$
$IV$. $(RCO)_2O$

Which of the following compounds is most reactive with $NaHCO_3$?

The strongest acid is

Identify the reagent used in the following reaction: $\text{Benzoic acid} \xrightarrow[\Delta]{\text{Reagent}} \text{Benzoyl chloride} + \text{Phosphorus oxychloride} + \text{Hydrogen chloride}$.