The most acidic carboxylic acid is

$CH_3CO_2C_2H_5$ on reaction with sodium ethoxide in ethanol gives $A$,which on heating in the presence of acid gives $B$. Compound $B$ is

The correct order of decreasing acid strength of trichloroacetic acid $(A)$,trifluoroacetic acid $(B)$,acetic acid $(C)$,and formic acid $(D)$ is

Product $B$ in the following reaction is: $CH_3-COOH$ $\xrightarrow{NH_3, \Delta} A$ $\xrightarrow{P_2O_5, \Delta} B$

Identify the compounds $A$,$B$,and $C$ in the following reaction sequence:
$CH_3-Br$ $\xrightarrow{Mg, \text{Ether}} [A]$ $\xrightarrow[(ii) \text{Water}]{(i) CO_2} [B]$ $\xrightarrow{CH_3OH, H^+} [C]$

The order of decreasing rate of reaction with ammonia is: