Arrange the following hydrogen halides in order of their decreasing re

1.	Arrange the following hydrogen halides in order of their decreasing reactivity with propene.
Answer» `HCL gt HBr gt HI` `HBr gt HI gt HCl` `HI gt HBr gt HCl` `HCl gt HI gt HBr` Solution :REACTIVITY of hdydrogen halides depends upon bond dissociation energy and bond strength. As the SIZE of halogen atom increase in hydrogen halides, the bond strength decreases and bond dissociation energy also decreases. Therefore, the CORRECT order of reactivity is `HI gt HBr gt HCl`.

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