The reaction of sugar with concentrated $HNO_3$ yields ....

Arrange the following in decreasing order of their acidic strength: $C_6H_5COOH$,$FCH_2COOH$,$NO_2CH_2COOH$. Give an explanation for the arrangement.

In the following reactions,$P, Q$ and $R$ are

Which of the following does not give alcohol on reduction?

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 $3.$

The most suitable reagent for the given conversion is