Toluene reacts with chromyl chloride to form $.....$.

In the reaction:
$C_6H_5-H \xrightarrow{[X] / AlCl_3} C_6H_5-C(=O)-CH_2-C_6H_5$
$[X]$ will be:

The structure of $X$ is :

$A$ man has been asked to synthesize the molecule shown in the image. He thought of preparing the molecule using an aldol condensation reaction. He found a few cyclic alkenes in his laboratory. He thought of performing an ozonolysis reaction on an alkene to produce a dicarbonyl compound,followed by an aldol reaction to prepare "$x$". Predict the suitable alkene that can lead to the formation of "$x$".

What reagent is used in the Etard reaction?

Identify the product of the following reaction:
$C_6H_6 + CO + HCl \xrightarrow{AlCl_3} \text{Product}$