Which one of the following does not dissolve in conc. `H_2 SO_4`
| A. |
`CH_3—C -= C—CH_3` |
| B. |
`Ch_3—CH_2—C-=CH` |
| C. |
`CH -= CH` |
 |
| D. |
`CH_2 = CH_2` |
If `CH-=CH` were to di s solve in `H_2SO_4` a bi sulphit e sal t of vinyl carbocation `H_2C = C^+H` would be formed. The mor e s-charact er in the pos it ively charged 'C' , less stable i s the carbocation and les s l ikely to be formed.