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Q.

Arrange the following alkenes in the descending order of their reactivity with HBr
a) Ethene
b) Propene
c) 2-Butene
d) 2-Methyl-2-butene

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a

$a > b > c > d$

b

$d > c > b > a$

c

$d > c > a > b$

d

$a > b > d > c$

answer is B.

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Detailed Solution

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The addition of $HBr$ to alkenes takes places via ionic intermediates in Markovnikov addition sequence.
The alkene also produces ions (cation and anion), the more is the stability of carbocation more will be its reactivity towards $HBr$ .
More the number of methyl groups attached to alkene carbon more will be its stability.
The stability order of carbocation is 2-Methyl-2-butene>2-Butene>Propene> Ethene and so the same order follows towards reactivity with $HBr$ .

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