Which reagent gives an orange-coloured precipitate with acetaldehyde?

Which of the following reagents converts phenyl methyl ketone into ethylbenzene?

In the given reaction $CH_3-CH_2-C(=O)-CH_2-COOC_2H_5$ $\xrightarrow{[X]} (A)$ $\xrightarrow{(i) LiAlH_4, (ii) H_2O/H^{+}} CH_3-CH_2-C(=O)-CH_2-CH_2OH + C_2H_5OH$,$[X]$ will be:

Which one is most reactive towards nucleophilic addition reaction?

In the following reactions,
$CH_3COCH_3 \xrightarrow[(ii) D_3O^+]{(i) NaBH_4} X$
$CH_3COCH_3 \xrightarrow[(ii) H_3O^+]{(i) NaBD_4} Y$
$X$ and $Y$ are

The product $(Q)$ will be: