$$ \text { Consider the series of reactions given and identify the final product [Z]. } $$

$$ [X] \xrightarrow{\mathrm{CrO}_3}[Y] \quad \xrightarrow[\text { (ii) } \mathrm{H}_2 \mathrm{O}]{\text { (i) } \mathrm{CH}_3 \mathrm{MgBr}}[Z] $$

Etard reaction is a method of preparation of benzaldehyde by oxidation of toluene. The oxidizing agent used in this reaction is:

Propanal on reaction with dilute NaOH , undergoes aldol condensation resulting in the formation of a compound A . identify the correct structure of A and name of the compound.

$$ \text { Identify the compounds } \mathrm{A} \text { and } \mathrm{B} \text { from the following reaction sequence: } $$