MCQ
Arrange the following hydrogen halides in order of their decreasing reactivity with propene :
- A$\text{HCl > HBr > HI}.$
- B$\text{HBr > HI > HCl}.$
- ✓$\text{HI > HBr > HCl}.$
- D$\text{HCl > HI > HBr}.$
✓
Answer
Correct option: C.
$\text{HI > HBr > HCl}.$
The decreasing order of reactivity of hydrogen halides with propene is $\text{HI > HBr > HCl}$.
As the size of halogen increases, the strength of $H–X$ bond decreases and hence, reactivity increases.
As the size of halogen increases, the strength of $H–X$ bond decreases and hence, reactivity increases.
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