Which of the following is used as a reagent in the Etard reaction?

Acetophenone is prepared from

Identify the compound formed by the action of chromyl chloride on toluene in the presence of $CS_2$,followed by hydrolysis.

Identify the product in the following reaction: $Pent-3-enenitrile \xrightarrow[H_3O^+]{AlH(i-Bu)_2} \text{Product}$

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

An organic compound $X$ gives a red precipitate on heating with Fehling's solution. Which one of the following reactions yields $X$ as a major product?