Which one of the following is not present in the nitration mixture ?

Options

A. `overset(+)NO_(2)`
B. `HSO_(4)^(-)`
C. `SO_(4)^(2-)`
D. `H_(2)O`

Answer

C

Explanation

Nitration mixture contains equimolar ratio (i.e.1 :1 ) of nitric acid and sulphuric acid . It contains `overset(+)NO_(2), HSO_(4)^(-) and H_(2)O` species,
It does not contain `SO_(4)^(-)` ions. This canbe explained on the basisof generation of nitronium `overset(+)NO_(2)` ion from nitrating mixture.
Generation of ` overset(+)NO_(2)` ion
Step I
Step II `H-overset(H)overset(|)(O^(+))-NO_(2)hArroverset(+)NO_(2)+H_(2)O`