The carboxylic acid with the highest $pK_{a}$ and lowest $pK_{a}$ values among the following are respectively:

The increasing order of acidic strength among the following compounds is
$I.$ Benzoic acid
$II.$ $4-$nitrobenzoic acid
$III.$ $3, 4-$dinitrobenzoic acid
$IV.$ $4-$methoxybenzoic acid

Identify $X$ and $Y$ in the following reaction scheme:

In the given reaction,the reactant is $\gamma$-valerolactone. Predict the product $[X]$ for the reaction: $\text{Reactant} \xrightarrow{H_2O/H^{+}} [X]$.

Which dicarboxylic acid,in the presence of a dehydrating agent,is least reactive to form an anhydride?

How many of the following compounds react with $NaHCO_3$ to evolve $CO_2$ gas?
$I$: $3$-Nitrophenol
$II$: $2,4$-Dinitrophenol
$III$: $4$-Hydroxybenzoic acid
$IV$: $4$-Methylbenzoic acid
$V$: $4$-Chlorophenol
$VI$: $2,4$-Dinitrotoluene
$VII$: $4$-Hydroxybenzenesulfonic acid
$VIII$: $4$-Sulfobenzoic acid
$IX$: Squaric acid
$X$: Maleic acid