What is used in the silvering of mirrors?

Acetaldehyde when treated with dilute $NaOH$ gives:

The product formed in the given reaction sequence is:

Which is the major product of the following reaction?

In the Cannizzaro reaction given below,the slowest step is $:-$
$2Ph-CHO \xrightarrow{\stackrel{\ominus}{O}H} PhCH_2OH + PhCO_2^{\ominus}$

$A$ compound $(X)$ possesses a smell like bitter almond.
$(i)$ It does not give the Fehling test.
$(ii)$ It gives the silver mirror test.
$(iii)$ Compound $(X)$ gives orange precipitates of benzaldehyde $2,4-$dinitrophenylhydrazone with $2,4-DNP$.
Identify compound $(X)$ and provide its chemical reactions.