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  3. Chemistry
  4. Arrange the following hydrogen halides in order of their decreasing reactivity with propene.

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Q. Arrange the following hydrogen halides in order of their decreasing reactivity with propene.

Hydrocarbons

Solution:

The order of reactivity of the hydrogen halides is $HI > HBr > HCl$. As the size of halogen increases, the strength of $H — X$ bond decreases and hence, reactivity increases.