The following reagent converts $C_6H_5COCHO$ to $C_6H_5CHOHCOONa$.

The solution of Fehling $B$ contains . . . . . . .

Compound $CH_3-CO-CH_2-OH$ reduces:

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.

The end product $(B)$ of the above reaction is:

$\underset{\text{symmetrical Ketone}}{(A)}\,$ $\xrightarrow{LiAlH_{4}}(B)$ $\xrightarrow[\Delta ]{H^{\oplus }}\text{Diastereomers}$
Reactant $(A)$ is