From which of the following substances is acetone prepared?

Provide the missing product in the following reaction:
$CH_3-CH=CH-CH_2OH \xrightarrow{PCC} (?)$

What is obtained when acetyl chloride is reduced in the presence of $BaSO_4$ and $Pd$?

The reagents used in the Etard reaction $(I)$ and the Stephen reaction $(II)$ are:

What is $Z$ in the following reaction sequence?
$C_6H_5NH_2$ $\xrightarrow[(i) NaNO_2 + HCl / 273 \ K]{(ii) H_3PO_2 + H_2O}$ $\xrightarrow[(iii) CO, HCl, \text{anhydrous } AlCl_3/CuCl]{} Z$

Identify the compound $C$ in the following sequence:
$(CH_3)_2CHCH_2C \equiv N$ $\xrightarrow{HCl, H_2O} \text{compound } A$ $\xrightarrow[2. H_2O]{1. LiAlH_4} \text{compound } B$ $\xrightarrow{PCC, CH_2Cl_2} \text{compound } C$