Acetic acid is treated with $Ca(OH)_2$ and the product so obtained is subjected to dry distillation. The final product is

Which of the following reagents is used in Gatterman-Koch formylation of arene?

$R-CN \xrightarrow[(ii) H_2O]{(i) DIBAL-H} R-Y$
Consider the above reaction and identify $Y$.

Nitriles are reduced to corresponding imine with stannous chloride in the presence of hydrochloric acid,which on hydrolysis gives the corresponding aldehyde. This reaction is called:

The major product obtained in the reaction of isobutylbenzene with acetic anhydride in the presence of anhydrous $AlCl_3$ is:

Identify the reagent used for Rosenmund reduction.