Carbon reacts with conc. `H_(2)SO_(4)` to gives

HCOOH reacts with conc. H_(2)SO_(4) to give :

Copper reacts with hot conc. H_(2)SO_(4) to give:

Zinc reacts with dilute H_(2)SO_(4) to give H_(2) . It also reacts with conc. H_(2)SO_(4) to give SO_(2) . How will you account for this difference ?

Formic acid reacts with conc . H_(2)SO_(4) to give :

Tin reacts with conc. H_2SO_4 to give:

Anisole with conc. H_(2)SO_(4) gives.

Acetone on treating with conc H_(2)SO_(4) gives