What is the name of the reaction when $C_6H_5CHO$ (benzaldehyde) changes into $C_6H_5CH_2OH$ (benzyl alcohol)?

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

Identify the product for the following reaction: $CH_3-CO-CH_3 + HO-CH_2-CH_2-OH \xrightarrow{HCl} ?$

The compound which does not respond to iodoform test is

Identify the final product in the following reaction sequence: $R-CHO$ $\xrightarrow{HS-(CH_2)_3-SH}$ $\xrightarrow{n-BuLi}$ $\xrightarrow{D_2O}$ $\xrightarrow{HgCl_2/CdCO_3, H_2O} \text{Product}$

Reduction of aldehydes and ketones to hydrocarbons takes place in the presence of: