Which one of the following does not dissolve in conc. `H_(2)SO_(4)`?

Options

A. `CH_(3)-C=C-CH_(3)`
B. `CH_(3)-CH_(2)-C=CH`
C. `CH-=CH`
D. `CH_(2)=CH_(2)`

Answer

C

Explanation

If `CH-=CH` were to dissolve in `H_(2)SO_(4)` a bisulphite salt of vinyl carbocation `H_(2)C=C_(+)H` would be formed. The more `s-` character in the positively charged `'C'`, less stable is the carbocation and less likely to be formed.