Product of the reaction is

Identify the product $A$ in the following reaction:
$1$-phenylcyclohex-$1$-en-$1$-one $\xrightarrow[(2) H^+]{(1) PhMgBr/CuCl} (A) (C_{19}H_{20}O)$

Two aliphatic aldehydes $P$ and $Q$ react in the presence of aqueous $K_2CO_3$ to give compound $R$,which upon treatment with $HCN$ provides compound $S$. On acidification and heating,$S$ gives the product shown below:
$1.$ The compounds $P$ and $Q$ respectively are:
$2.$ The compound $R$ is:
$3.$ The compound $S$ is:
Give the answer for questions $1$,$2$ and $3$.

Cannizzaro reaction is not shown by

Compound $CH_3-CO-CH_2-OH$ reduces:

The reaction of butanal with $n$-propylmagnesium bromide gives a