What is the product of the following reaction?

Which of the following is correct for the reaction shown?

The treatment of $Ph_2C(OH)CH_2NH_2$ with $NaNO_2 - HCl$ gives a product $(P)$ which on oxidation gives benzoic acid only. Identify the product $(P)$.

$CH_3-CHO \xrightarrow{NaOH + Cl_2} A + HCOONa$. Product $A$ can be used as:

When liquid $A$ is treated with a freshly prepared ammoniacal silver nitrate solution,it gives a bright silver mirror. The liquid forms a white crystalline solid on treatment with sodium hydrogensulphite. Liquid $B$ also forms a white crystalline solid with sodium hydrogensulphite but it does not give a test with ammoniacal silver nitrate. Which of the two liquids is an aldehyde? Write the chemical equations of these reactions also.

Which of the following does not react with $NaHSO_3$ (sodium bisulphite)?