In the given compounds,which one does not give the silver mirror test?

An optically active alkyl bromide $C_4H_9Br$ reacts with ethanolic $KOH$ to form major compound $[A]$, which reacts with bromine to give compound $[B]$. Compound $[B]$ reacts with ethanolic $KOH$ and sodamide to give compound $[C]$. One molecule of water adds to compound $[C]$ on warming with mercuric sulphate and dilute sulphuric acid at $333 \text{ K}$ to form compound $[D]$. The functional group in compound $[D]$ will be confirmed by:

When two molecules of acetaldehyde condense in the presence of dilute alkali,it forms

$(C_2H_5O)_2CO \xrightarrow[H_3O^{+}]{CH_3MgBr(\text{excess})} A$. $A$ (alcohol) can also be obtained by:

$n$-hexane $\xrightarrow{Al_2O_3/\Delta} (A)$ $\xrightarrow{(CO + HCl)/AlCl_3} (B)$. Select the incorrect statement among the following:

In the given compound,how many functional groups are reduced by $LiAlH_4$ (Lithium aluminium hydride) and $NaBH_4$ (Sodium borohydride) respectively? (Assume the compound contains an ester,an acid,a ketone,and an aldehyde group).