Which of the following is the structural formula of mesityl oxide?

What is the product obtained when $m$-chlorobenzaldehyde is treated with a $50\% KOH$ solution?

The major product of the following reaction is

Tollen's reagent and Fehling solutions are used to distinguish between

Which statement is correct for product '$X$'?
$Cl-CO-CH_2-C(C \equiv CH)(CH_2-CN)-CH_2-CH_2-CO-CH_3 \xrightarrow{H_2/Pd/BaSO_4} X$

$A$ compound $A$ with molecular formula $C_{10}H_{13}Cl$ gives a white precipitate on adding silver nitrate solution. $A$ on reacting with alcoholic $KOH$ gives compound $B$ as the main product. $B$ on ozonolysis gives $C$ and $D$. $C$ gives Cannizzaro reaction but not aldol condensation. $D$ gives aldol condensation but not Cannizzaro reaction. $A$ is: