Identify the compound that exhibits tautomerism:

Which does not react with Fehling solution?

$CH_3COOCH_2CH_3 + PhMgBr_{(excess)} \to P \xrightarrow{H_2O} Q$;
$Q$ is

In the following reaction, the major product $(H)$ is

Which of the following will be dehydrated most readily in alkaline medium?

In the reaction scheme shown below,$Q$,$R$,and $S$ are the major products. Identify the correct structure of the products from the given options:
$(P)$ + Succinic anhydride $\xrightarrow{AlCl_3}$ $Q$
$Q$ $\xrightarrow[H_3PO_4]{Zn-Hg/HCl}$ $R$
$R$ $\xrightarrow[(ii) H_3O^+]{(i) CH_3MgBr, (iii) H_2SO_4/\Delta}$ $S$
$(A)$ $S$ is [Structure $A$]
$(B)$ $Q$ is [Structure $B$]
$(C)$ $R$ is [Structure $C$]
$(D)$ $S$ is [Structure $D$]