Which of the following hydrocarbons is the most reactive towards addition of $H_{2} S O_{4}$ ?

Ethene

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Propylene

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3-methyl but-1-ene

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1-butene

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Solution

The correct option is C 3-methyl but-1-ene
As $π$ -bond is more activated, the addition of $H_{2} S O_{4}$ is carried out faslly.
In the given compound, 3-methyl but-1-ene. Undergoes rapid addition, because $π$ -bond is activated by hyperconjugation and after addition the most stable $3^{o} -$ carbocation is formed.a
$C H_{2} = C H_{2} H_{2} S O_{4} - --- \to C H_{3} - {\oplus C H}_{2}$
$1^{o} - c a r b o c a t i o n$
$C H_{3} - C H = C H_{3} H_{2} S O 4 - --- \to C H_{3} - {\oplus C H}_{2} - C H_{3}$
$2^{o} - c a r b o c a t i o n$
$C H_{3} - C H_{2} - C H = C H_{2} H_{2} S O_{4} - --- \to C H_{3} C H_{2} - \oplus C H - C H_{3}$
$2^{o} - c a r b o c a t i o n$

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