$CH_3-CH(OH)-CN$ is

Which of the following reactions does not give benzaldehyde as a product?

$CH_3COCl \xrightarrow{Pd/BaSO_4, H_2} CH_3CHO + HCl$
The above reaction is called:

What sequence of steps represents the best synthesis of $4-heptanol$ $(CH_3CH_2CH_2)_2CHOH$?

$Benzaldehyde$ can be obtained from $benzal$ chloride. Write reactions for obtaining $benzal$ chloride and then $benzaldehyde$ from it.

In the Rosenmund's reduction,$BaSO_4$ taken with catalyst $Pd$ acts as