Hydrolysis of acetonitrile in acidic medium gives

If ethylene,carbon monoxide and water are heated at high temperature,which of the following is formed?

What will be the final product of the following reaction sequence?
$CH \equiv CH$ $\xrightarrow{CH_3MgBr}$ $\xrightarrow{CO_2/H_3O^+}$ $\xrightarrow{HgSO_4/H_2SO_4}$ $\xrightarrow{Ag_2O, \Delta} ?$

In the presence of air,the fermentation of ethyl alcohol by $Acetobacter$ $aceti$ bacteria forms:

What is the name of the reaction: $CH_3-CH=CH_2 \xrightarrow{CO + H_2O, H^+} CH_3-CH(COOH)-CH_3$?

Toluene can be oxidised to benzoic acid by