In the preparation of an ester,the commonly used dehydrating agent is

The major product formed by the nitration of benzoic acid is $......$.

The descending order of acidity among the following compounds is:

$CH_3-CH_2-COOH$ $\xrightarrow{Br_2 / Red P} X$ $\xrightarrow{Alc. KOH / \Delta} Y$. $Y$ in the above reaction is:

In the following sequence,products $I$,$J$ and $L$ are formed. $K$ represents a reagent.
$1.$ The structure of the product $I$ is
$2.$ The structures of compounds $J$ and $K$ respectively are
$3.$ The structure of product $L$ is
Give the answer for questions $1, 2$ and $3.$

On heating acetamide in the presence of $P_2O_5$,which of the following is formed?