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Q.
Which of the following reacts most readily with concentrated $H_2SO_4$?
Hydrocarbons
Solution:
The alkene, i.e. $(CH_3)_2C = CH_2$ which gives most stable carbocation on addition of a proton is most reactive. $(CH_3)_2C = CH_2 + H^+ → (CH_3)_3C^+$