Which of the following carboxylic acid undergoes decarboxylation easily ?

How will you bring about the following conversion in not more than two steps? 

Benzoic acid to m-Nitrobenzyl alcohol

The increasing order of the reactivity of the following with $\text{L}\text{i}\text{A}\text{l}{\text{H}}_4$ is:

$\left(A\right)$

$\left(B\right)$

$\left(C\right)$

$\left(D\right)$

In the following reactions, $\mathbf{P},\mathbf{Q},\mathbf{R}$, and $\mathbf{S}$ are the major products.

The correct statement(s) about $\mathbf{P},\mathbf{Q},\mathbf{R}$, and $\mathbf{S}$ is(are)

The decreasing order of ease of alkaline hydrolysis for the following esters is