What is the reaction of benzaldehyde with aniline called?

The major product of the following reaction is

Acetone on treatment with $CH_3MgI$ and on further hydrolysis gives:

Benzalacetone is the product of mixed aldol condensation between benzaldehyde $(C_6H_5CHO)$ and acetone $(CH_3COCH_3)$. What is its structure?

$P$ is an optically active compound with molecular formula $C_6H_{12}O$. When $P$ is treated with $2,4-$dinitrophenylhydrazine,it gives a positive test. However,in the presence of Tollens reagent,$P$ gives a negative test. Predict the structure of $P$.

Product $C$ is