Which of the following is least reactive towards nucleophilic addition?

$Ph-C(=O)-CH_3 \xrightarrow{NaOCl} A + \text{salt}$
$A + CH_3-C(=O)-CH_3 \rightarrow B$
$B$ is

The reaction shown in the image is called:

Benzene on reaction with acetyl chloride in the presence of anhydrous $AlCl_3$ gave the product $P$. The product $P$ on reaction with methyl magnesium bromide followed by treatment with water furnished the product $Q$. The molecular formula of $Q$ is

Acetaldehyde and acetone differ in their reaction with

The major product $(P)$ in the following reaction is $:$