What is the initial product obtained from the hydrolysis of cyanide?

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

Which reaction is suitable for the preparation of $\alpha$-chloroacetic acid?

Identify the product formed in the following reaction.
$C_6H_5-CH_2-CH_3 \xrightarrow[ii) H_3O^{+}]{i) \text{alk. } KMnO_4} \text{Product}$

What is the final product of the following reaction sequence?
$C_4H_8$ $\xrightarrow[\text{peroxide}]{\text{HBr}} X$ $\xrightarrow[\text{(ii) } CO_2]{\text{(i) Mg/dry ether, (iii) } H_3O^+} Y$

In the following reaction,the compound $B$ will be:
$C_2H_5Br$ $\xrightarrow{KCN} A$ $\xrightarrow{\text{Hydrolysis}} B$