Most stable product of the following reaction is:

Which one of the following reactions does not represent correct combination of substrate and product under the given conditions?

An organic compound 'A' on reaction with NH₃ followed by heating gives compound B. Which on further strong heating gives compound C (C₈H₅NO₂). Compound C on sequential reaction with ethanolic KOH, alkyl chloride and hydrolysis with alkali gives a primary amine. The compound A is :

During the denaturation of proteins, which of these structures will remain intact?