Identify 'B' in the following reaction
Ethyl cyanide $\xrightarrow{\large{\text{H}_2\text{O}}} \text{A} \xrightarrow{\large{\text{H}_2\text{O / dil HCl}}} \text{B} + \text{NH}_3$

Which from following amines when heated with ethanolic KOH and chloroform does NOT produce foul smell ?

Identify glycosidic linkage in lactose.

Identify a protein present in nails