A: Propene reacts with $HBr$ to give isopropyl bromide.
R: The addition of hydrogen halide to alkenes follows Markownikoff's rule.

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$A$ and $R$ are true, $R$ explains $A$

$A$ and $R$ are true, $R$ does not explain $A$

$A$ is true, but $R$ is false

$A$ is false, but $R$ is true

answer is A.

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Detailed Solution

The addition of $HBr$ on propene takes place in accordance to Markownikoff's rule, i.e., negative part of the additive goes to that carbon atom which is linked with lesser number of hydrogen atoms. The addition of an electrophile involves the intermediate formation of a more stable carbonium ion. Propene reacts with $HBr$ to give isopropyl bromide.

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